Black seborrheic keratosis: identification and care

Seborrheic keratosis is a non-cancerous skin growth. Its colour can overlap with other pigmented lesions, so visual resemblance is not enough for self-diagnosis.

These growths are often sharply outlined with a rough, warty or waxy surface that appears attached to the skin. They may occur alone or in groups and can become irritated by clothing, jewellery or shaving.

Black colour does not by itself make a lesion dangerous or harmless. A dermatologist considers the border, internal pattern, surface and history, often using a handheld magnifier. If the appearance remains unclear, sampling or removal can establish the diagnosis.

Leave a confirmed, comfortable seborrheic keratosis alone unless it catches, itches, bleeds from friction or is unwanted cosmetically. Do not shave it off or apply wart acid, because injury can cause bleeding, infection or pigment change.

A clinician may discuss freezing, curettage with cautery, or electrosurgery after confirming the lesion. The choice depends on thickness, location, skin type and the likelihood of a lighter or darker mark after healing.

Book a skin check when a dark growth is new, its diagnosis has never been confirmed, or it changes in size, outline, colour or surface. Spontaneous bleeding, persistent crusting, ulceration, pain or marked inflammation also warrant timely review.

Seek faster assessment if a lesion changes rapidly or produces bleeding that will not stop with firm pressure. Urgency comes from those warning features, not from black colour alone.

Ask how confident the diagnosis is, whether examination with magnification is sufficient, and whether removed tissue needs laboratory assessment. You can also ask which removal method suits the site and how wound care may affect pigment and scarring.