What should you know about squamous keratoacanthoma?

Keratoacanthomas often appear as firm, rounded bumps with a central plug or crater. They commonly develop on sun-exposed skin, although appearance alone cannot establish the diagnosis. A clinician may consider sun-damaged skin, an inflamed lesion, or a skin cancer with a similar surface. Examination and tissue sampling may be needed to distinguish these possibilities.

Do not try to remove the central plug at home. Picking can cause bleeding, irritation, infection, and a less clear examination. The lesion's growth pattern, location, borders, and tissue findings help guide care.

Arrange a dermatology appointment soon, especially if the lump is enlarging over days or weeks, repeatedly crusts, or becomes tender. Take a clear photograph beside a ruler before the visit, and note when you first noticed it and how quickly it changed.

A clinician may recommend removal so the complete lesion can be examined. Options can include curettage and cautery or surgical excision, selected according to the lesion's size, position, depth, and clinical appearance. Protect nearby skin from further ultraviolet exposure with shade, clothing, and suitable sunscreen.

Seek prompt medical review for a rapidly enlarging bump, persistent bleeding, an open sore, increasing pain, spreading redness, or drainage. Seek urgent care if bleeding will not stop after firm direct pressure or if you develop fever with worsening redness.

Ask whether the lesion needs a biopsy or complete removal, which procedure best fits its location, how the wound will be cared for, and when you will receive the tissue result. Ask how to monitor the surrounding sun-damaged skin.