Keratoacanthoma and skin cancer

A keratoacanthoma often appears as a firm, dome-shaped lump with a central keratin plug. Its quick growth and microscopic appearance can overlap with squamous cell carcinoma, a skin cancer that begins in surface skin cells. Because the two may be difficult to separate in a small sample, clinicians usually assess the whole lesion and its surroundings rather than relying on a symptom or photograph.

The risk context includes the lesion’s site, depth, growth pattern, and the pathology wording. This does not mean every fast-growing lump is cancer; it means an unexplained or changing lump deserves a proper assessment.

A dermatologist may inspect the lesion closely, ask when it changed, and take a biopsy or remove it for laboratory examination. Treatment is chosen after considering the report, location, and practical wound-care needs. Options can include [Surgical Excision](/treatments/surgical-dermatology/excisional-surgery/) or [Curettage And Cautery](/treatments/surgical-dermatology/curettage-and-cautery/). Do not cut, burn, or drain the lump yourself.

Protect the site from friction while awaiting care and use sun-safe habits. Repeated ultraviolet exposure contributes to [Sun-Damaged Skin](/conditions/photoaging/), which can accompany other sun-related skin changes.

Arrange a dermatology appointment promptly for a lump that grows quickly, forms a persistent crust, bleeds, becomes tender, or fails to heal. Seek urgent advice for uncontrolled bleeding, fever with spreading redness, pus, or severe pain. A lesion close to the eye, nose, mouth, ear, or a nail should be assessed without delay because treatment may need to protect nearby structures.

Ask whether the lesion needs a biopsy or complete removal, how the pathology will distinguish keratoacanthoma from squamous cell carcinoma, and whether the edges were fully assessed. Clarify wound care, scar expectations, the timing of results, and how often you should check your skin afterward.