Non-healing skin sore
A sore, ulcer or spot on the skin that does not heal within the usual few weeks, or heals and comes back. Common causes include poor circulation, pressure and diabetes, but a persistent sore — especially on sun-exposed skin — can occasionally be a skin cancer and is worth having checked.
What it means
Skin normally heals a minor wound within a couple of weeks. A sore that lingers well beyond that, or that keeps breaking down and returning, is a signal worth attention. There are several common, non-cancer reasons. Poor blood supply is a frequent one: leg ulcers from vein problems or from narrowed arteries heal slowly, and pressure sores develop where skin is compressed over a long time. Diabetes is important, because it impairs healing and reduces sensation, so sores — especially on the feet — can persist and get infected without being felt; a new, slow-healing foot sore in someone with diabetes always needs prompt care. Infection itself can keep a sore open. Separately, and importantly, some skin cancers present exactly as a sore that will not heal: a persistent, sometimes crusty or bleeding spot or ulcer, often on sun-exposed areas like the face, ears or hands, that may seem to heal and then reopen. These skin cancers are usually very treatable when caught early. So while most non-healing sores have a benign explanation, one that persists — particularly on sun-exposed skin — is worth showing to a doctor.
Common causes
- Poor circulation — venous leg ulcers, or ulcers from narrowed arteries; slow to heal.
- Pressure sores — where skin is compressed over time.
- Diabetes — impaired healing and reduced sensation, especially foot sores.
- Infection — keeping a wound open or causing it to spread.
- Skin cancer — a persistent sore, spot or ulcer that won't heal, often on sun-exposed skin; usually treatable when caught early.
- Repeated irritation or an underlying skin condition.
Lab work-up approach
A non-healing sore is assessed mainly by looking at it and considering the whole picture — its site, appearance, how long it has been there, and circulation and sensation in the area. Blood tests support this: glucose and HbA1c to check for diabetes, and a full blood count and inflammatory markers if infection is suspected. If a skin cancer is possible, the definitive step is examining and often taking a sample (biopsy) of the sore, not a blood test. Mediora.AI can surface a glucose or HbA1c pattern suggesting diabetes as a reason for poor healing, but a persistent or suspicious sore — especially on sun-exposed skin — is assessed by looking at it and, if needed, a biopsy, by your doctor.
Tests Mediora.AI can interpret
Related conditions
Panels to consider
When to see a doctor
See a doctor for any skin sore that has not healed within about three to four weeks, that heals and keeps returning, or that is growing, crusting, bleeding, or looks unusual — especially on sun-exposed skin such as the face, ears, scalp or hands, where a persistent sore can be a treatable skin cancer. People with diabetes should seek prompt care for any new or slow-healing sore, particularly on the feet, as these can worsen quickly. A sore with spreading redness, warmth, swelling or fever suggests infection and needs earlier review. Most non-healing sores have a treatable, benign cause, and early assessment allows both the common causes and the occasional skin cancer to be addressed in good time. Mediora.AI can flag glucose and related markers alongside your symptoms; a persistent or suspicious sore is assessed by your doctor.