What should you know about multiple keratoacanthoma?

A keratoacanthoma may appear as a rounded lump with a central area of keratin or crust. Several lesions can develop in different areas, and their appearance can overlap with other growths, including some forms of skin cancer. A diagnosis cannot be made reliably from a photograph or from speed of growth alone. Long-term sun exposure is one relevant background factor; you can read about Sun-Damaged Skin for context.

Arrange a dermatology appointment soon and record when each lump appeared, how quickly it changed, and whether it bleeds, hurts, or catches on clothing. Do not squeeze, shave, or pick the lesions. The dermatologist may examine all affected areas and recommend sampling or removal. Options can include Curettage And Cautery or Surgical Excision, chosen according to the lesion, its site, and the clinical diagnosis.

Seek prompt medical attention for a lump that is rapidly enlarging, repeatedly bleeding, increasingly painful, ulcerated, or interfering with daily activity. Contact a clinician urgently if redness is spreading, there is pus, or you develop fever. Multiple new or changing lesions also deserve a timely review even when they are not painful.

Ask whether the lesions need biopsy, which growths should be treated first, how scars may look at each site, and what skin checks are appropriate after treatment.