It’s common to get small cuts, scrapes, and skin injuries, and most will mend themselves. Your body’s natural healing process involves clotting, cleaning, and rebuilding, so in one to two weeks, the wound will likely be forgotten.

The challenge lies in identifying when an injury is becoming a concern. While the signs might be faint, they could point to an underlying condition. This guide explains what to look for.

What A Healthy Healing Wound Looks Like

In the first day or two, a wound may look and feel slightly worse before it gets better. Signs of normal healing include:

• Mild redness along the wound edges, not spreading outward
• Slight warmth and swelling as your immune system responds
• Clear or light pink drainage in small amounts
• Pain that eases day by day, with swelling settling by day three or four
• New tissue forming under the scab, often pink, slightly bumpy, and slightly raised (granulation tissue)

Behind the scenes, wound healing moves through four overlapping phases:

• Hemostasis: When bleeding stops
• Inflammation: Immune cells clean the wound
• Proliferation: New tissue and blood vessels form
• Remodeling: The scar strengthens and matures

Most acute wounds finish that whole process within 4 to 6 weeks.

Signs of An Infected Wound 

Common signs of infection include:

• Redness that spreads outward from the wound edges rather than staying contained
• Swelling that worsens after the first few days instead of settling
• Warmth that feels hotter than the surrounding skin
• Yellow, green, or cloudy pus, especially with a foul odor
• Increasing pain or tenderness when it should be improving
• Delayed healing, where the wound stalls or looks the same day after day

Some symptoms are more serious. They may point to an underlying infection that has moved beyond the skin itself. Seek medical attention if you notice:

• Fever or chills 
• Red streaks extending from the wound toward the trunk of the body
• Swollen, tender lymph nodes near the wound
• Feeling generally unwell, fatigued, or lightheaded

How Wound Infections Develop 

Common causes include bacteria entering through broken skin, poor wound hygiene, dressings that go too long between changes, and foreign material left in the wound (such as dirt, splinters, or glass).

Certain conditions and habits may increase your risk of an infected wound:

• Diabetes impairs immune response and slow tissue repair
• Poor circulation in the lower legs and feet
• Weakened immune system from illness or medications
• Smoking reduces oxygen delivery to healing tissue
• Larger or deeper wounds where more tissue is exposed
• Wounds on the lower legs or feet face more mechanical stress

How To Care For A Wound At Home

• Wash your hands before touching the wound or changing the dressing
• Rinse the wound gently with clean running water; you don’t need hydrogen peroxide or iodine, which can irritate healthy tissue
• Keep it covered with an appropriate dressing to keep it clean and moist
• Change dressings as recommended, or sooner if they get wet, dirty, or saturated
• Watch for change daily; healing should trend better, not worse

What Not To Do 

• Don’t pick at scabs or peel dressings roughly. Both interrupt the tissue rebuilding underneath.
• Don’t over-clean with harsh antiseptics day after day. It slows healing.
• Don’t ignore worsening symptoms hoping they’ll settle. Early attention beats late intervention every time.
• Don’t leave foreign material in the wound. If you can’t remove it safely, get a professional assessment.

When To See A Doctor

See a healthcare professional if any of the following apply to you:

• Redness that continues to spread.
• Pus develops, especially yellow, green, or foul-smelling drainage.
• Pain becomes more severe.
• The wound isn’t improving after several days of proper care.
• You develop fever, chills, or red streaks.
• If you live with diabetes or poor circulation.
• The wound is deep, gaping, or from a bite or dirty object.

When A Wound Becomes Chronic

Chronic wounds are those that remain open for approximately 4 to 6 weeks, even with regular treatment. The wound becomes trapped in the inflammatory phase, experiencing recurrent infections and slow healing rather than progressing to closure.

Common reasons include:

• Persistent infection that keeps the wound inflamed.
• Poor blood supply, especially in the lower legs.
• Ongoing pressure or friction on the wound site.
• Underlying medical conditions like diabetes or venous disease.
• Long-term inflammation from unresolved causes.

Once a wound has stalled, general first-aid rarely closes it. It usually requires professional chronic wound care treatment that correctly identifies the factors that are delaying healing.

At Vega Dermatology & Wound Care Unit, every case starts with an assessment by our qualified physicians to identify what’s blocking healing, whether that’s circulation, infection, glycemic control, tissue quality, or a combination of them. 

Advanced care may include growth factor support strategies under medical supervision. We use targeted bio-signals like VEGF and PDGF, which are proteins your body naturally uses to grow new blood vessels and skin tissue, to help jumpstart healing in areas where circulation or repair has stalled. 

This is especially helpful for individuals with diabetic wounds, those needing surgical repair, or patients whose wounds aren’t healing with standard treatments. Schedule a consultation with our clinical team for a wound care assessment or treatment plan.

References:

• Wound Healing Phases. Retrieved November 7, 2026, from https://www.ncbi.nlm.nih.gov/books/NBK470443/
• Physiology, Wound Healing. Retrieved November 7, 2026, from https://www.ncbi.nlm.nih.gov/books/NBK535406/
• Wound Assessment. Retrieved November 7, 2026, from https://www.ncbi.nlm.nih.gov/books/NBK482198/
• How wounds heal. Retrieved November 7, 2026, from https://medlineplus.gov/ency/patientinstructions/000741.htm

If this is happening right now

• Cool the burn under cool running water for 20 minutes. Start as soon as possible. Cooling still helps if begun within three hours of the injury.
• Do not use ice, iced water, toothpaste, fish sauce, butter, oil, or herbal pastes. Ice causes blood vessels to constrict, which can deepen the burn or cause a cold injury.
• Remove clothing and jewellery from the area unless it is stuck to the skin. Swelling comes quickly.
• Call emergency services (1669 in Thailand) or go to hospital immediately for large burns, burns to the face, hands, feet, genitals or joints, burns that go all the way around a limb, chemical or electrical burns, any burn in a child, or if smoke was inhaled.

This article is educational. It does not replace emergency care. Vega Dermatology & Wound Care Unit is an outpatient clinic and does not provide emergency burn treatment. We support smaller outpatient burns, post-hospital recovery, and treatment for burn scars.

Burn first aid, and why 20 minutes is the number

A burn is not a single event. Heat continues to transfer into tissue after the source is removed, and the injury can progress in depth over the following 48 hours. Prompt first aid limits how far that damage travels.

Cool running water at roughly 8 to 25 degrees Celsius for at least 20 minutes has been shown to reduce burn depth. If cooling is started within three hours of the injury, it reduces pain and swelling, slows cellular metabolism in oxygen-starved tissue, dampens the inflammatory response, and improves wound healing while reducing scarring.

A prospective cohort study drawing on the Burn Registry of Australia and New Zealand analysed patients treated between 2009 and 2012 and found that first aid cooling before arrival at a burn service was associated with reduced injury severity across measured outcomes.

Cool running water dissipates heat better than a cold compress. Ice and iced water should be avoided because vasoconstriction can deepen the burn or cause a cold injury.

After cooling:

• Cover loosely with cling film laid over the wound, not wrapped tightly around a limb, or with a clean non-fluffy cloth
• Keep the person warm overall, since prolonged cooling of a large burn can drop body temperature dangerously
• Do not burst blisters
• Take simple analgesia if there is no contraindication
• Seek medical review, even if it looks minor

When a burn needs hospital or specialist care

Not every burn can be managed at home or at a general emergency department. Referral to a specialised burn centre is recommended for:

• Burns to the face, hands, feet, genitals, or across joints, because of the risk of functional impairment and scarring
• Suspected inhalation injury, suggested by facial burns, singed nasal hair, or smoke exposure in an enclosed space
• Burns in children, due to the complexity of pain and wound management and the need to screen for non-accidental injury
• Electrical burns, including low-voltage ones, because internal damage can appear days later
• Chemical burns
• Large burns by total body surface area
• Circumferential burns encircling a limb or the chest
• Any burn expected to take longer than 14 days to heal, because of hypertrophic scarring risk

That last criterion is the one most often missed in general practice, and it is the one that determines whether a patient ends up with a manageable scar or a disabling one.

Understanding burn depth

Burn depth determines healing time, scarring risk, and whether surgery is needed. Modern classification uses descriptive terms rather than only degrees.

Depth is not always obvious in the first 48 hours, which is exactly why a burn that looks superficial on day one should still be reviewed. Reduced or absent sensation is a warning sign, not a good sign. It suggests nerve endings have been destroyed.

How burn wounds actually heal

Wound healing is not linear, and understanding the phases helps explain why scars behave the way they do.

• Inflammatory phase, days 0 to 5. Blood vessels constrict then dilate, immune cells arrive, and debris is cleared. Swelling, redness, and pain belong to this phase. Excessive or prolonged inflammation here is one of the strongest predictors of a bad scar later.
• Proliferative phase, days 4 to 21. New tissue forms. Fibroblasts lay down collagen, new blood vessels grow, and keratinocytes migrate across the wound to close it. This is where the two to three week threshold sits. If the wound closes within this window, scarring risk stays relatively low. Deeper partial thickness burns that stall here can convert into non-healing wounds, which is a different clinical problem covered on our chronic wound and skin repair page.
• Remodelling phase, week 3 to 24 months. The disorganised collagen laid down quickly during proliferation is gradually replaced by stronger, better-aligned collagen. A scar is at its most red, raised, and firm somewhere between two and six months, then slowly softens and fades. This is why the scar you have at month three is not the scar you will have at month eighteen, and why patience is genuinely part of the treatment.

Hypertrophic scars raise because collagen production outruns collagen breakdown. They stay within the original wound boundary. Keloids extend beyond it and do not regress spontaneously, and they occur more frequently in Asian, African, Middle Eastern, and Latin American skin. That makes keloidal burn scarring a realistic risk for many patients in Thailand, and it needs a more aggressive plan than a hypertrophic scar does. See our keloid treatment page for how that differs.

Severe burn treatment: what happens in hospital

Major burn care is inpatient work, and it is worth knowing the outline so the process is less frightening.

• Resuscitation. Large burns cause massive fluid shifts. Intravenous fluid resuscitation in the first 24 to 48 hours is calculated by body weight and burn surface area, and is adjusted against urine output.
• Airway management. Inhalation injury can cause airway swelling that develops over hours. Early intubation may be needed before swelling makes it difficult.
• Wound management and debridement. Dead tissue is removed, because it feeds infection and blocks healing.
• Grafting. Full thickness burns and many deep partial thickness burns will not close on their own. Split-thickness skin grafts, and in some cases dermal substitutes, are used to achieve closure. Faster closure means less scarring.
• Infection control and nutrition. Burn patients are hypermetabolic and immunosuppressed. Nutritional support and infection surveillance are central, not peripheral.
• Early rehabilitation. Splinting, positioning, and range of movement work start early, because contractures form fast and are far easier to prevent than to release.

Treatment for burn scars

Once the skin is intact and stable, scar management begins. The evidence base here is clearer than most patients expect.

Silicone

Silicone gel or silicone gel sheeting is universally considered the first-line prophylactic and treatment option for hypertrophic scars and keloids, and international clinical recommendations support it as first-line therapy for widespread burn hypertrophic scars once the epithelium is intact and stable. It works by hydrating and occluding the scar rather than by any drug effect.

Practical points: apply to closed skin only, never to open wounds, use it for at least 12 hours a day, and continue for months rather than weeks. Gel formulations tend to have better adherence than sheeting because they are easier to use in visible areas and in a humid climate.

Pressure therapy

Custom pressure garments applied to healing burn scars are a long-standing part of burn rehabilitation. The critical point for timing is that pressure prevents scars but does not treat them once they are established. Referral should be initiated promptly at the first sign of hypertrophic scarring, or if the wound misses expected healing milestones.

Intralesional corticosteroid

For raised, firm, itchy, or painful scars, injected corticosteroid remains a mainstay alongside silicone. Concentrations used on the face and neck are usually limited to reduce the risk of skin atrophy. It is a therapeutic agent rather than a preventive one.

Fractional laser

Positive data supports the use of fractional lasers for burn scar treatment, and ablative fractional lasers offer the advantage of fewer sessions than non-ablative options. A single-centre retrospective review of 110 ablative fractional CO2 sessions across 40 adult and paediatric patients with hypertrophic burn scars found no infectious complications, no skin complications, and no unplanned admissions within six weeks of any treatment, concluding that the approach was safe and well tolerated.

Laser is used to improve pliability, reduce thickness, relieve itch, and improve range of movement across joints. It is a functional treatment as much as a cosmetic one.

Massage, moisturising, and itch control

Scar massage, consistent moisturising, and itch management are unglamorous and genuinely useful. Itch after re-epithelialisation is very common and can be treated with moisturisers, cool cloths, massage, and oatmeal preparations, with oral antihistamines as first-line for moderate to severe itch. Scratching prolongs inflammation and worsens the scar, so controlling itch is scar treatment, not just comfort.

Sun protection

Newly healed skin exposed to direct sunlight can develop permanent hyperpigmentation. Sunscreen with SPF of at least 50 should be used, and direct sun avoided, for up to two years after the burn. In Thailand this is a serious commitment and it needs to be said plainly at discharge, not buried in an information sheet.

Scar management timeline

Warning signs during recovery

Return for review promptly if you notice:

• Increasing pain, redness spreading beyond the wound, pus, odour, or fever
• A wound that has not closed within two to three weeks
• A scar that is becoming raised, red, and firm
• Tightness that limits movement of a joint
• Numbness or shooting nerve pain, which is more common after full thickness burns
• A wound that closed and then broke down again

Contractures across joints are far easier to prevent with early therapy than to correct with surgery later.

How burn care works at Vega Dermatology & Wound Care Unit

We want to be precise about scope, because getting this wrong costs people tissue.

We are not an emergency burn service. Large burns, burns to the face, hands, feet, genitals or major joints, suspected inhalation injury, electrical and chemical burns, and any deep partial thickness or full thickness burn need a hospital burn unit first. Call 1669 or go directly. We coordinate with those teams rather than replacing them.

What we do handle falls into two phases.

• Phase 1, burn wound healing. Smaller outpatient burns, and patients discharged from a burn unit who still have open areas, fragile grafts, or wounds that have stalled. Standard care here is wound cleansing, debridement of devitalised tissue, topical antimicrobials, appropriate moisture-balance dressings, and monitoring for infection or conversion to a deeper injury. For selected stalled or complex burns we add regenerative protocols, including growth factor media intended to support angiogenesis and granulation. These sit on top of standard care rather than in place of it.
• Phase 2, treatment for burn scars and contractures. This is where most of our burn work happens, and where timing matters more than technology:

Preventive measures start as soon as the wound has closed and any grafts are stable. Laser and injections come later, once the skin is robust and infection risk is low. Complex or long-standing cases may also involve our scar and tissue remodeling service.

A chronic ulcer is not a wound that is healing slowly. It is a wound that has stopped healing altogether. That distinction matters more than almost anything else in this article, because it changes what treatment has to accomplish.

Effective chronic ulcer treatment has to do two jobs at the same time. First, fix the reason the wound stalled, whether that is poor blood flow, unrelieved pressure, hidden infection, or runaway inflammation. Second, rebuild the biology that closes it. Dressings on their own rarely manage either.

So if you have been changing dressings for months and the wound looks much the same as it did in week four, that is not bad luck. It is a clinical signal, and it usually means the plan needs to change rather than continue.

What follows is a plain explanation of what chronic ulcers are, why they behave differently from ordinary wounds, what good care looks like, and where advanced options such as growth factor and stem cell therapy genuinely fit. It is written for patients and families weighing up their choices, including anyone considering treatment for chronic wounds in Thailand.

What Is a Chronic Ulcer?

A chronic ulcer is an open wound that has failed to move through the normal stages of repair in the time you would expect. Most wound centres work to a simple rule of thumb:

If a wound has not healed, or has not meaningfully shrunk, after four to six weeks of appropriate care, treat it as chronic.

Healthy wounds pass through four phases: haemostasis, inflammation, proliferation, and remodelling. A chronic ulcer gets stuck in the inflammatory phase and stays there. The wound bed fills with destructive enzymes called matrix metalloproteinases (MMPs), which break down the same collagen scaffold that new tissue depends on. Growth factor signalling drops off. Bacteria organise themselves into protective biofilms. Between them, these changes create an environment that is actively hostile to healing.

This is the key idea behind everything else on this page. A chronic ulcer is a biological problem sitting underneath a visible wound, which is why treatment aimed only at the surface tends to plateau.

Chronic wounds are also more common than most people realise. A 2024 systematic review and meta-analysis put global chronic wound prevalence at roughly 1.67 per 1,000 people, with mixed-aetiology chronic wounds at 2.21 per 1,000. That represents tens of millions of patients and a disproportionate share of healthcare spending worldwide.

The Four Main Types of Chronic Ulcers

Chronic ulcer treatment is only ever as good as the diagnosis behind it. Two wounds that look almost identical on the lower leg can have completely different causes, and completely different correct treatments.

Diabetic foot ulcers carry the highest stakes of the four. Lifetime risk among people with diabetes is estimated at 19 to 34%. Recurrence reaches around 42% within one year and 65% within five years. Five-year mortality after a DFU sits near 30%, and rises above 70% following major amputation. Foot ulceration precedes most non-traumatic lower-limb amputations in people with diabetes, which is why waiting to see whether one closes on its own is rarely the safest choice.

Venous leg ulcers are the most common leg ulcer overall, affecting roughly 1% of adults and up to 4% of people over 65. Compression therapy remains the single intervention with the strongest evidence for healing them. Patients who cannot tolerate or do not stick with compression tend to take at least twice as long to heal and face far higher recurrence rates.

If your wound falls into the diabetic category, our page on diabetic foot ulcer treatment in Thailand covers Wagner staging, offloading, and regenerative options in more detail.

Why Chronic Ulcers Don’t Heal on Their Own

Five mechanisms account for most stalled wounds. A thorough treatment plan screens for all of them rather than assuming one.

Ischaemia, or poor blood supply. Oxygen and nutrients are the fuel for repair. Peripheral artery disease starves the wound bed, and no dressing compensates for absent perfusion. Vascular assessment using ABI, toe pressures, or duplex imaging should come before any advanced therapy is considered.

Neuropathy, or loss of protective sensation. In diabetes, nerve damage means blisters, callus breakdown, and pressure points go completely unnoticed. A small injury becomes a deep ulcer before the patient feels anything at all.

Unrelieved pressure. A plantar foot ulcer exposed to normal walking is re-injured with every step. Without offloading, whatever healing happens in clinic is undone at home.

Bacterial biofilm. Biofilms are structured bacterial communities wrapped in a protective matrix that resists both antibiotics and the immune system. Systemic antibiotics alone often fail against them. Sharp debridement is what physically breaks them up.

Chronic inflammation and lost signalling. The raised MMP activity and depleted growth factors described earlier mean the wound has lost its instructions for rebuilding, even when everything else has been optimised.

What Every Chronic Ulcer Treatment Plan Must Include

Before anything advanced enters the conversation, the fundamentals need to be in place. The internationally accepted framework for preparing a wound to heal is TIME:

• T, tissue management. Removing necrotic and non-viable tissue through debridement. This is repeated, not a one-off.
• I, infection and inflammation control. Culture-guided antimicrobials, biofilm disruption, and treatment of the underlying inflammation.
• M, moisture balance. The wound bed needs to be moist enough for cells to migrate, but dry enough to avoid maceration of the surrounding skin. Dressing choice follows from that balance.
• E, edge advancement. Watching whether the wound margin is genuinely migrating inward, which is the clearest single sign that healing has restarted.

Alongside TIME, four cause-specific measures do most of the heavy lifting:

1. Offloading for diabetic foot ulcers, using total contact casting, removable walkers, or bespoke orthotics.
2. Graduated compression for venous leg ulcers, which carries the highest level of evidence for VLU healing.
3. Pressure redistribution and repositioning for pressure injuries.
4. Systemic optimisation, covering glycaemic control, nutrition (particularly protein and micronutrients), smoking cessation, and oedema management.

Skipping these steps and jumping straight to an advanced therapy is the most common reason advanced therapies disappoint. Regenerative treatment works as a catalyst. It does not work as a substitute.

When Standard Care Isn’t Enough

If a wound has been properly prepared, offloaded, and cleared of infection, and it still has not improved after four weeks, it qualifies as hard-to-heal. At that point, escalating treatment is reasonable.

Growth Factor Therapy (VEGF and PDGF)

Two signalling proteins coordinate much of wound repair.

• VEGF (Vascular Endothelial Growth Factor) drives angiogenesis, the sprouting of new capillaries into the wound bed. It restores the oxygen and nutrient supply that ischaemic tissue is missing.
• PDGF (Platelet-Derived Growth Factor) recruits fibroblasts, the cells that produce collagen and build the new tissue scaffold.

Because the two act on different stages of the healing cascade, one on blood supply and one on tissue construction, using them together covers more of the pathway than either does alone. At Vega, this is delivered as VEGF & PDGF Ultra Enhanced Media, applied directly to a prepared wound bed during scheduled clinical visits and reviewed for response at each stage. The full pathway is set out on our chronic wound and skin repair page.

Stem Cell Treatment for Diabetic Foot Ulcers: What the Evidence Shows

Stem cell treatment for diabetic foot ulcers is one of the most actively researched areas in wound medicine, and also one of the most frequently oversold. Here is a fair reading of where the literature currently stands.

Mesenchymal stem cells (MSCs) appear to help chronic wounds mainly through paracrine signalling. Rather than becoming new skin themselves, they release growth factors and exosomes that instruct the cells already present in the wound bed. The proposed effects are promoting angiogenesis, calming excessive inflammation, and coordinating fibroblast activity.

The clinical evidence is encouraging, though still maturing:

• A meta-analysis of 28 randomised controlled trials covering 1,096 participants found autologous stem cell therapy was associated with significantly higher complete healing rates in chronic lower-extremity wounds (RR 1.67).
• A meta-analysis of 6 RCTs covering 380 patients on umbilical cord derived MSCs for diabetic foot ulcers and peripheral artery disease reported better ulcer healing (OR 2.88), along with improvements in pain, skin temperature, and ulcer area.
• Adverse events reported across these trials were generally transient, minor, and local, which supports a reasonable short-term safety profile.

The caveats deserve equal weight. Trial sizes are small. Cell sources and protocols vary widely between studies. Follow-up is often short. Regulatory status differs considerably from country to country. No credible clinic should present stem cell therapy as a guaranteed cure for a non-healing ulcer.

At Vega Derma, these regenerative principles are delivered as bio-active growth factor signalling rather than live cell implantation, within a structured, physician-supervised protocol. We state that plainly because patients researching this area deserve accuracy rather than marketing language.

Other Advanced Adjuncts

• Negative pressure wound therapy (NPWT) reduces oedema and encourages granulation in deep or heavily exuding wounds.
• Hyperbaric oxygen therapy (HBOT) is hospital-based and considered for selected ischaemic and Wagner grade 3 and above diabetic wounds.
• Cellular and tissue-based products, sometimes called skin substitutes, are bioengineered grafts for wounds with adequate perfusion.
• Platelet-rich plasma (PRP) is an autologous concentrate of the patient’s own growth factors.

Vega Derma operates as a specialist outpatient regenerative wound clinic. Cases needing inpatient surgery, revascularisation, or hyperbaric facilities are coordinated with the appropriate hospital services rather than managed in-house. That boundary is worth confirming with any clinic you are considering.

How to Tell Whether Your Treatment Is Working

You should not have to guess. There is a well-validated benchmark, often called the four-week rule:

A wound that has not reduced in area by roughly 50% after four weeks of appropriate treatment is unlikely to close on that trajectory and should be formally reassessed.

The landmark study behind this found that diabetic foot ulcers with above-median area reduction at four weeks went on to a 12-week healing rate of 58%, compared with just 9% for those below it. The dividing line fell at about 53% area reduction. Put simply, four weeks of measurement tells you far more than four months of hoping.

Making that benchmark usable requires objective tracking. At minimum, your clinic should be recording:

• Wound area in mm² at every visit, including length, width, and depth
• Serial photographic documentation taken under consistent conditions
• Tissue quality, meaning the proportion of granulation against slough or necrosis
• Exudate volume, odour, and the condition of the surrounding skin
• Edge advancement, or whether the margin is actually moving inward

If your current provider cannot show you a measured trend line, that is a fair reason to seek a second opinion. Good records also help international patients share documented progress with a referring physician or insurer back home.

Chronic Ulcer Treatment in Thailand: Why Patients Travel

Thailand has become a recognised destination for treatment for chronic wounds, for four connected reasons.

• Cost. Advanced regenerative wound care in Thailand typically costs a fraction of the equivalent in the US, UK, or Australia, with itemised quotations issued after assessment rather than open-ended billing.
• Continuity with one team. Chronic ulcer treatment is a long process. Being followed by the same specialists from assessment through to closure avoids the detail loss that happens in rotating-staff hospital clinics.
• Access. Specialist wound assessment can usually be arranged within days rather than months.
• English-speaking support, including help with scheduling, travel, and documentation for overseas patients.

One practical note for anyone planning to travel. Chronic ulcer treatment is not a single-visit procedure. Ask any clinic for an honest estimate of how many visits you will need, how far apart they fall, and how much of the care can continue at home under remote supervision, all before you book flights.

What a Structured Pathway Looks Like

Candidacy matters at every stage. Regenerative support is generally suitable for chronic wounds open beyond six weeks with adequate blood supply and controlled infection. It is not appropriate as a standalone therapy for wounds requiring urgent surgery, for severe ischaemia awaiting vascular intervention, or during active uncontrolled infection. In those cases the right first step is hospital referral, with reassessment afterwards.

Preventing Recurrence After the Ulcer Closes

Closure is a milestone rather than an endpoint. The circulation and nerve changes that caused the first ulcer do not disappear once the skin seals over, which is why a previously ulcerated foot is formally classified as at-risk, or Wagner Grade 0.

Prevention that has evidence behind it includes:

• Daily foot inspection for blisters, redness, callus, or new pressure points
• Professional nail and callus care, never self-treated in a neuropathic foot
• Therapeutic footwear and custom orthotics to redistribute plantar pressure
• Lifelong compression hosiery after a healed venous ulcer, where the difference in recurrence rates between compression and none is substantial
• Tight glycaemic control and sustained nutritional support
• Prompt review of any new wound, however minor it looks

Frequently Asked Questions

When does a wound become a chronic ulcer? 

Most wound centres classify a wound as chronic once it has not healed after roughly four to six weeks of appropriate care. A wound that stops shrinking, keeps reopening, or becomes repeatedly infected should be assessed as chronic regardless of exactly how long it has been there.

What is the best treatment for a chronic ulcer? 

There is no single best treatment, because the right plan depends on why the wound stalled. The strongest results come from combining debridement, infection and biofilm control, moisture balance, cause-specific mechanical management such as offloading or compression, and, for wounds that remain stalled, regenerative support such as growth factor therapy.

Can stem cell therapy heal a non-healing ulcer? 

Research suggests stem cell based approaches may support healing in selected cases by improving cellular signalling, encouraging new blood vessel formation, and reducing chronic inflammation. Meta-analyses report better healing rates than conventional care alone, though trials remain small and protocols vary. It is used alongside standard wound care, never as a replacement for debridement and infection control.

How long does chronic ulcer treatment take? 

Timelines vary widely. Smaller, well-perfused ulcers may show clear improvement within a few weeks once infection is controlled and pressure is relieved. Deep or long-standing wounds can take several months, and progress depends heavily on blood sugar control, perfusion, and how consistently offloading or compression is maintained.

Is my treatment failing if the ulcer hasn’t closed yet? 

Not necessarily, but it should be measurably smaller. If the wound has not reduced in area by roughly half after four weeks of appropriate treatment, the plan should be formally reassessed rather than simply continued at the same intensity.

What does chronic ulcer treatment cost in Thailand? 

Cost depends on ulcer type and stage, infection status, debridement requirements, the number of visits, and whether regenerative therapy is included. Reputable clinics assess first and quote second. Vega provides an itemised estimate after clinical assessment rather than a fixed package price.

Can a chronic ulcer be treated without surgery? 

Many can. Most chronic ulcers are managed through structured outpatient wound care. Surgery becomes necessary for deep infection, osteomyelitis, gangrene, or when revascularisation is needed to restore blood supply, which is exactly why vascular assessment forms part of the initial workup.

The Bottom Line

Chronic ulcer treatment works when it is diagnostic before it is therapeutic. Work out why the wound stalled, correct that cause, prepare the wound bed properly, take the mechanical load off it, and only then bring in regenerative support to restart the biology.

If your wound has stayed open beyond four to six weeks despite consistent care, that is the moment to seek specialist assessment rather than repeat the same routine for another month.

Book a wound assessment with Vega’s clinical team to have your case staged and a documented plan prepared. You can also read more about our chronic wound and skin repair programme or our diabetic foot ulcer treatment pathway.

Reviewed by Vega’s wound care specialists, who bring over 15 years of combined clinical experience in regenerative wound management. Meet our doctors.

References:

1. Martinengo L, et al. Prevalence of chronic wounds in the general population: systematic review and meta-analysis of observational studies. Annals of Epidemiology. https://pubmed.ncbi.nlm.nih.gov/30497932/ 
2. Digital Health Interventions for Chronic Wound Management: A Systematic Review and Meta-Analysis. Journal of Medical Internet Research, 2024. https://www.jmir.org/2024/1/e47904
3. Armstrong DG, Boulton AJM, Bus SA. Diabetic Foot Ulcers and Their Recurrence. New England Journal of Medicine, 2017. https://www.nejm.org/doi/full/10.1056/NEJMra1615439
4. Armstrong DG, Tan TW, Boulton AJM, Bus SA. Diabetic Foot Ulcers: A Review. JAMA, 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC10723802/
5. Diabetic Foot Ulceration and Complications. StatPearls, NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK499887/
6. Autologous Stem Cell Therapy for Chronic Lower Extremity Wounds: A Meta-Analysis of Randomized Controlled Trials. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8699089/
7. Zhang H, Gu Y, Zhang K, Ouyang C. Safety and Efficacy of Umbilical Cord Mesenchymal Stem Cell Therapy for Diabetic Foot Ulcers and Peripheral Artery Disease: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. 2026. https://doi.org/10.1177/15347346261426552
8. Advancements in mesenchymal stem cell therapy for chronic wounds: challenges, innovations, and future directions. Frontiers in Cell and Developmental Biology. https://pmc.ncbi.nlm.nih.gov/articles/PMC12832901/
9. Efficacy and safety of stem cell therapy in patients with chronic lower extremity ulcers: an umbrella review of systematic reviews and meta-analyses. Stem Cell Research & Therapy. https://link.springer.com/article/10.1186/s13287-025-04853-x
10. He Y, et al. Prevention strategies for the recurrence of venous leg ulcers: A scoping review. International Wound Journal, 2024. https://onlinelibrary.wiley.com/doi/full/10.1111/iwj.14759
11. Compression therapy for preventing venous leg ulcers returning. Cochrane Review. https://www.cochrane.org/evidence/CD002303_compression-therapy-preventing-venous-leg-ulcers-returning
12. VenUS IV, compression hosiery compared with compression bandaging in the treatment of venous leg ulcers. NIHR Journals Library / NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK262504/
13. Sheehan P, Jones P, Caselli A, Giurini JM, Veves A. Percent Change in Wound Area of Diabetic Foot Ulcers Over a 4-Week Period Is a Robust Predictor of Complete Healing in a 12-Week Prospective Trial. Diabetes Care, 2003. https://diabetesjournals.org/care/article/26/6/1879/26496/Percent-Change-in-Wound-Area-of-Diabetic-Foot

Minor cuts and surgical incisions usually close within a few weeks. For some patients, however, the wound stalls instead of healing, where the skin around the edge stops moving inward, the wound bed looks unchanged week after week, and what should have been a short recovery turns into months of dressings and discomfort. 

When a wound behaves this way, it stops being a simple injury and becomes a medical condition that needs structured evaluation. These are known as chronic wounds, and there are a few types.

When a Wound Is Considered Chronic

A wound is generally classified as a chronic wound when it fails to show meaningful, measurable signs of healing within 4 to 6 weeks of basic standard treatment. How long a wound is considered chronic can vary slightly by clinical setting, but 4 to 6 weeks remains the standard threshold across most wound care guidelines.

You do not always have to wait the full 6 weeks before seeking help. Early warning signs in the first 10 to 14 days, such as spreading redness, persistent odor, excessive fluid discharge, or worsening pain, are reasons to have the wound evaluated sooner. Early specialist input can reduce the risk of deeper tissue damage and complications, particularly in patients with diabetes, circulation problems, or limited mobility.

Why Chronic Wounds Get Stuck in Healing

Normal wound healing moves through four phases: hemostasis, inflammation, proliferation, and tissue remodeling. A chronic wound typically gets stuck in the inflammatory phase. Instead of shifting toward building new tissue, the wound stays in a prolonged inflammatory state. Consequently, cellular activity becomes dysfunctional, the signaling proteins do not switch off when they should, and the wound bed remains open and vulnerable.

This stalled state is rarely about the wound alone, as the healing process is often stalled by underlying issues, including poor circulation, uncontrolled blood sugar, sustained pressure on the area, persistent bacterial activity, or compromised nutrition. Addressing those root factors is usually as important as treating the wound itself, which is why a thorough clinical evaluation matters before any treatment plan is built.

The Main Chronic Wound Types Explained

Four chronic wound types account for the majority of cases seen in specialist wound care.

1. Venous leg ulcers are the most common. They result from poor vein function in the lower legs, known as venous insufficiency. Blood pools in the lower extremities, raising pressure in the veins and damaging the skin from within. The result is shallow, weeping sores, usually on the inner lower leg around the ankle. These ulcers can recur even after they close if the underlying vein issue is not managed.
2. Diabetic ulcers arise from a combination of nerve damage and reduced arterial circulation. Patients with neuropathy may lose sensation in the feet, so a small pressure spot or unnoticed injury can deepen into a stubborn ulcer before it is felt. Poor circulation slows the delivery of oxygen and nutrients needed for diabetic wound repair, and elevated blood sugar can affect the immune response that normally helps clear bacteria from the wound.
3. Arterial ulcers are triggered by narrowed arteries, often from peripheral artery disease. Restricted blood flow means the feet and toes do not receive enough oxygen-rich blood. The resulting wounds are typically deep, painful, and slow to heal, and they are often found on the toes, heels, or outer ankle.
4. Pressure injuries, sometimes called bedsores, develop when uninterrupted pressure on skin over bony areas, such as heels, ankles, or hips, cuts off blood flow. Tissue damage can occur quickly, particularly in individuals with limited mobility or reduced sensation, and the wound can extend deeper than the surface appearance suggests.

How Specialist Wound Care Can Support Healing

Chronic wounds rarely respond to off-the-shelf bandages because the underlying issue is usually upstream of the wound itself. At Vega Dermatology & Wound Care Unit, wound care begins with clinical evaluation, involving identifying the wound type, assessing circulation and any contributing conditions, and reviewing what has been tried so far.

From there, care is built around a structured pathway of wound bed preparation, infection control where needed, and advanced local care matched to the wound type. For suitable candidates, regenerative support such as VEGF and PDGF Ultra Enhanced Media may be considered under physician supervision as part of the wider plan. Tissue response is tracked objectively over time, with the approach adjusted as the wound progresses.

The clinical posture is conservative and protective, with the aim being to break a wound out of its stalled phase, protect surrounding skin, manage complications early, and reduce the likelihood of escalation. Even so, it’s important to note that treatment response varies depending on individual factors, including underlying health and the wound’s history.

When to Seek Specialist Wound Care

A wound that has been open for over a month is no longer a simple injury, instead being a chronic condition that benefits from professional management. Early specialist clinical action is the most reliable way to reduce the risk of deeper infection and other complications down the line.

Most wounds heal in a clear, predictable way within a few weeks. A chronic wound is different — it gets stuck partway through healing and can stay open for months, even with consistent care. If you’re searching for chronic wound treatment, you likely already know the frustrating part: the wound isn’t necessarily getting worse, but it isn’t closing either.

This guide explains what makes a wound chronic, how modern chronic wound healing treatment actually works, what the healing timeline looks like, and when it’s time to see a wound care specialist.

What Is a Chronic Wound?

A chronic wound is a wound that fails to move through the normal, orderly stages of healing within an expected timeframe. In clinical practice, a wound is generally treated as chronic when it shows no meaningful improvement after 4 weeks, or has not fully closed by 12 weeks (roughly 3 months).

The Wound Healing Society groups most chronic wounds into four main types:

• Diabetic foot ulcers — driven by high blood sugar, nerve damage, and reduced circulation.
• Venous leg ulcers — the most common type, caused by poor return of blood in the leg veins.
• Pressure injuries (bed sores) — from sustained pressure in people with limited mobility.
• Arterial (ischemic) ulcers — caused by restricted arterial blood flow.

How a Wound Normally Heals

Understanding chronic wound healing starts with understanding how a healthy wound closes. Healing is a coordinated biological process that unfolds in four overlapping phases, each depending on the one before it:

1. Hemostasis (minutes to hours): Blood vessels tighten and a clot forms to seal the wound and create a barrier against bacteria.
2. Inflammation (first few days): Immune cells arrive to clear bacteria and damaged tissue. Some redness, warmth, and mild swelling are normal here.
3. Proliferation — building new tissue (next few weeks): New skin cells, blood vessels, and connective tissue fill the wound from the bottom up while the edges pull inward.
4. Remodeling — strengthening the skin (weeks to months): Collagen reorganizes and the scar softens. This phase can take a year or more; new tissue reaches only about 20% of its strength at three weeks and up to 80% at one year, which is why healed skin stays fragile for a long time.

A healthy (acute) wound completes all four phases in roughly four to six weeks. A chronic wound begins the same way but stops — most often during the inflammation phase — and cannot move forward on its own.

Acute vs. Chronic Wounds: The Key Difference

Why Wounds Become Chronic

Healing usually stalls for more than one reason at once — which is why chronic wound treatment almost always needs a layered approach:

• Biofilm: Bacteria build a thin, protective film over the wound surface that resists ordinary cleaning and dressings, keeping the wound locked in inflammation.
• Underlying health conditions: Diabetes, poor blood flow, and autoimmune disease slow healing across the whole body by limiting the delivery of oxygen, nutrients, and immune cells to the wound bed.
• Lifestyle and mechanical factors: Smoking, poor nutrition (especially low protein), and constant pressure on the wound all interrupt tissue repair.
• Repeated trauma or unrelieved pressure: Common in diabetic foot ulcers and pressure injuries, where the same spot is loaded again and again.

Treating the surface of a chronic wound without treating its cause is why so many wounds fail to close. Effective care addresses the wound, the cause, and the patient’s overall health together.

Chronic Wound Treatment: The Core Framework

Modern chronic wound healing treatment follows an evidence-based approach known as wound bed preparation, structured around the clinical mnemonic TIME (developed by wound care experts in 2002 and still central to practice today). The four elements are:

• T — Tissue: Removing dead or unhealthy tissue through debridement so healthy tissue can grow. Unlike acute wounds, chronic wounds often need repeated debridement. Methods include surgical (sharp), enzymatic, autolytic, and mechanical debridement.
• I — Infection / Inflammation: Controlling bacteria and biofilm using antimicrobial dressings, topical agents, or systemic medication when infection is present.
• M — Moisture balance: Keeping the wound moist enough to heal but not so wet that the surrounding skin breaks down. The right dressing depends on how much the wound drains.
• E — Edge of the wound: Supporting the wound edges so new skin can migrate across and close the gap.

Advanced Chronic Wound Treatments

When standard dressings and wound bed preparation aren’t enough — typically for wounds that are large, deep, or slow to respond — specialists turn to advanced therapies. The right combination depends on the wound type, the underlying cause, and how the wound has responded so far.

Negative Pressure Wound Therapy (NPWT)

Also called vacuum-assisted closure, NPWT places a sealed foam dressing over the wound and applies gentle, controlled suction. This draws out excess fluid, reduces swelling, and helps stimulate new tissue growth. It is widely used for deep or heavily draining wounds and to improve the success rate of skin grafts — one systematic review reported a mean graft “take” of around 92% when grafts were supported by NPWT.

Skin Grafts and Skin Substitutes

For wounds unlikely to close on their own, a skin graft transfers healthy skin (or a bioengineered skin substitute) onto the prepared wound bed to jump-start closure. Grafts require a clean, well-vascularized wound bed — which is why debridement and infection control come first.

Growth Factor Therapy

Growth factor treatment applies signaling proteins (such as platelet-derived growth factor) directly to the wound to reactivate healing at the cellular level. It’s typically reserved for wounds that remain stalled despite good wound bed preparation.

Offloading for Diabetic Foot Ulcers

Pressure offloading — using total-contact casts, special boots, or custom footwear — removes mechanical stress from the wound. For diabetic foot ulcers, offloading is often the single most important factor in healing.

Compression Therapy for Venous Leg Ulcers

For venous leg ulcers, compression therapy (bandages or medical stockings) improves blood return in the legs and is a cornerstone of long-term management.

Hyperbaric Oxygen and Adjunctive Therapies

In selected cases — particularly some diabetic ulcers — hyperbaric oxygen therapy and other adjunctive treatments may be added under specialist supervision.

Chronic Wound Healing Time: What to Expect

How long does a chronic wound take to heal? There’s no single answer — chronic wound healing time depends on the cause of the wound and the patient’s overall health. But a realistic timeline under specialist care looks like this:

• Weeks 0–2: The focus is on cleaning the wound, controlling infection, and reducing swelling. Visible change may be minimal — this is normal.
• Weeks 3–8: The earliest signs of restarted healing usually appear: new pink (granulation) tissue and a gradually shrinking wound.
• A few months: Many chronic wounds close within several months once healing resumes.
• Longer, complex cases: Deep diabetic ulcers or wounds with significant underlying disease may take longer and need ongoing advanced support.

If a wound has shown no improvement after four weeks of care, that is the point to seek specialist assessment — not to keep waiting.

When to See a Wound Care Specialist

See a specialist promptly if your wound:

• Shows no improvement after 2–4 weeks of care.
• Is growing, deepening, or draining more over time.
• Develops a foul odor, increasing redness, warmth, or spreading discoloration.
• Is accompanied by fever or worsening pain.
• Occurs in someone with diabetes, poor circulation, or reduced mobility — these wounds should be assessed early.

Untreated chronic wounds carry real risks: infection that can spread to deeper tissue or bone, reduced mobility, and in serious cases, tissue death or hospitalization. Early assessment is the single best way to change the outcome.

Specialist Chronic Wound Care in Bangkok

A chronic wound is rarely just a skin problem, so treating the surface alone is rarely enough. Real progress comes from assessing the wound, the underlying cause, and the patient’s overall health together.

Vega Dermatology & Wound Care provides comprehensive chronic wound treatment in Bangkok, focused on restarting stalled healing through careful assessment, structured wound bed preparation, and advanced signaling support. International patients are supported by English-speaking doctors and staff at every step.

A wound that won’t heal is a sign to act, not to wait. Book a consultation today and find out what proper care can do for a wound that has stalled.

Minor cuts and surgical incisions usually close within a few weeks. For some patients, however, the wound stalls instead of healing, where the skin around the edge stops moving inward, the wound bed looks unchanged week after week, and what should have been a short recovery turns into months of dressings and discomfort. 

When a wound behaves this way, it stops being a simple injury and becomes a medical condition that needs structured evaluation. These are known as chronic wounds, and there are a few types.

When a Wound Is Considered Chronic

A wound is generally classified as a chronic wound when it fails to show meaningful, measurable signs of healing within 4 to 6 weeks of basic standard treatment. How long a wound is considered chronic can vary slightly by clinical setting, but 4 to 6 weeks remains the standard threshold across most wound care guidelines.

You do not always have to wait the full 6 weeks before seeking help. Early warning signs in the first 10 to 14 days, such as spreading redness, persistent odor, excessive fluid discharge, or worsening pain, are reasons to have the wound evaluated sooner. Early specialist input can reduce the risk of deeper tissue damage and complications, particularly in patients with diabetes, circulation problems, or limited mobility.

Why Chronic Wounds Get Stuck in Healing

Normal wound healing moves through four phases: hemostasis, inflammation, proliferation, and tissue remodeling. A chronic wound typically gets stuck in the inflammatory phase. Instead of shifting toward building new tissue, the wound stays in a prolonged inflammatory state. Consequently, cellular activity becomes dysfunctional, the signaling proteins do not switch off when they should, and the wound bed remains open and vulnerable.

This stalled state is rarely about the wound alone, as the healing process is often stalled by underlying issues, including poor circulation, uncontrolled blood sugar, sustained pressure on the area, persistent bacterial activity, or compromised nutrition. Addressing those root factors is usually as important as treating the wound itself, which is why a thorough clinical evaluation matters before any treatment plan is built.

The Main Chronic Wound Types Explained

Four chronic wound types account for the majority of cases seen in specialist wound care.

1. Venous leg ulcers are the most common. They result from poor vein function in the lower legs, known as venous insufficiency. Blood pools in the lower extremities, raising pressure in the veins and damaging the skin from within. The result is shallow, weeping sores, usually on the inner lower leg around the ankle. These ulcers can recur even after they close if the underlying vein issue is not managed.
2. Diabetic ulcers arise from a combination of nerve damage and reduced arterial circulation. Patients with neuropathy may lose sensation in the feet, so a small pressure spot or unnoticed injury can deepen into a stubborn ulcer before it is felt. Poor circulation slows the delivery of oxygen and nutrients needed for diabetic wound repair, and elevated blood sugar can affect the immune response that normally helps clear bacteria from the wound.
3. Arterial ulcers are triggered by narrowed arteries, often from peripheral artery disease. Restricted blood flow means the feet and toes do not receive enough oxygen-rich blood. The resulting wounds are typically deep, painful, and slow to heal, and they are often found on the toes, heels, or outer ankle.
4. Pressure injuries, sometimes called bedsores, develop when uninterrupted pressure on skin over bony areas, such as heels, ankles, or hips, cuts off blood flow. Tissue damage can occur quickly, particularly in individuals with limited mobility or reduced sensation, and the wound can extend deeper than the surface appearance suggests.

How Specialist Wound Care Can Support Healing

Chronic wounds rarely respond to off-the-shelf bandages because the underlying issue is usually upstream of the wound itself. At Vega Derma Stem Cell Clinic, wound care begins with clinical evaluation, involving identifying the wound type, assessing circulation and any contributing conditions, and reviewing what has been tried so far.

From there, care is built around a structured pathway of wound bed preparation, infection control where needed, and advanced local care matched to the wound type. For suitable candidates, regenerative support such as VEGF and PDGF Ultra Enhanced Media may be considered under physician supervision as part of the wider plan. Tissue response is tracked objectively over time, with the approach adjusted as the wound progresses.

The clinical posture is conservative and protective, with the aim being to break a wound out of its stalled phase, protect surrounding skin, manage complications early, and reduce the likelihood of escalation. Even so, it’s important to note that treatment response varies depending on individual factors, including underlying health and the wound’s history.

When to Seek Specialist Wound Care

A wound that has been open for over a month is no longer a simple injury, instead being a chronic condition that benefits from professional management. Early specialist clinical action is the most reliable way to reduce the risk of deeper infection and other complications down the line.