Why can actinic keratosis cause a skin sore that does not heal?

Actinic keratosis develops in skin that has received repeated ultraviolet exposure. The affected patch may be rough, scaly, crusted, tender, or easily irritated. If the surface cracks or is repeatedly rubbed, a small sore or scab may persist because the damaged outer skin does not rebuild evenly.

A sore that stays open, bleeds with little contact, becomes painful, thickens, or changes appearance needs an examination. Actinic keratosis can resemble other skin conditions, and a clinician may need to examine the area closely or take a small sample. A persistent lesion should not be diagnosed from appearance alone.

Do not pick the scab or scrape the surface. Clean gently, protect the area from friction, and follow any dressing advice from a clinician. Use sun protection on exposed skin, including shade, clothing, and sunscreen as directed. Make a note of when the sore began and whether it bleeds, crusts, enlarges, or becomes tender.

Arrange a medical review for a sore that does not heal, especially if it is on a sun-exposed area or keeps returning. You can read more about [Skin Sore That Does Not Heal](/symptoms/non-healing-skin-sore/) while arranging care.

Seek prompt assessment if the area bleeds repeatedly, develops increasing pain, grows, forms a firm edge, produces discharge, or changes quickly. Urgent help is appropriate for heavy bleeding, spreading redness with fever, or severe pain. These signs do not identify one diagnosis, but they do make timely examination more important.

Ask whether the sore looks consistent with actinic keratosis, whether a sample is needed, which treatment is suitable for its size and location, and how to protect the surrounding skin. Ask when it should be reviewed if it remains open or returns.