What should you know about popping keratoacanthoma?

A keratoacanthoma can appear as a firm, rapidly growing dome-shaped lump with a central keratin plug, often on sun-exposed skin. Several lesions can look similar, including some forms of skin cancer, so a person cannot safely identify or treat one by squeezing it. Popping may cause bleeding, an open wound, infection, and extra inflammation that obscures useful clinical features. A history of sun-damaged skin is relevant, but it does not establish the diagnosis.

Do not scrape, freeze, burn, or apply unprescribed acids to the lump. Protect it from friction and sun, and cover any bleeding with gentle direct pressure and a clean dressing. Book a prompt dermatology examination, taking note of when it appeared, how quickly it changed, and whether it bleeds or hurts. After assessment, options may include surgical excision or curettage and cautery; the choice depends on the lesion and the clinician's findings.

Arrange prompt assessment for any fast-growing, crusted, bleeding, tender, or repeatedly scabbing skin lump. Seek urgent help if bleeding does not stop with steady pressure, or if the wound becomes increasingly red, warm, swollen, or draining. Do not wait for a suspected keratoacanthoma to settle on its own before obtaining a diagnosis.

What features make this lump look like a keratoacanthoma or another lesion? Is a biopsy or removal needed? Which treatment would leave the safest result in this location? How should I protect the area while waiting?