Large seborrheic keratosis: what to know

Seborrheic keratoses can be tan, brown, grey, or nearly black. Their surfaces range from smooth and waxy to thick and rough, and they may appear to sit on top of the skin. A larger growth can catch on clothing or become irritated by friction. Colour and texture can overlap with other lesions, including skin cancers, so appearance alone cannot confirm the diagnosis. A clinician may examine it closely and decide whether a sample is needed.

Leave an uncomplicated lesion alone if it is not bothersome, and avoid cutting, burning, or applying unverified removers at home. If it catches, bleeds after rubbing, itches persistently, or is unwanted cosmetically, a dermatologist can discuss cryotherapy, curettage and cautery, or electrosurgery. Choice depends on thickness, body site, pigmentation, and the possibility that the lesion needs laboratory examination. Healing may involve temporary crusting or a colour change.

Book a skin assessment for a growth that changes quickly, develops uneven colour or shape, bleeds without clear trauma, forms a persistent sore, or differs from your other lesions. Seek prompt care if bleeding does not stop with firm pressure. A rapidly appearing cluster of many growths also merits medical review.

Ask whether the lesion has the typical features of seborrheic keratosis, whether it needs a biopsy, and which removal method best protects the surrounding skin. Discuss expected crusting, pigment change, scarring, aftercare, and what to do if it returns.