Squamous Cell Keratoacanthoma Type

Keratoacanthoma can form a raised, firm nodule with a central keratin-filled crater. It may resemble a harmless spot, an inflamed cyst, or squamous cell carcinoma, and appearance alone cannot reliably separate them. Growth can be brisk, while the surrounding skin may look relatively normal. Long-term sun exposure and other skin damage can be relevant background factors; see [Sun-Damaged Skin](/conditions/photoaging/) for related information. A clinician may recommend a biopsy or complete removal so the tissue can be examined.

Arrange a dermatology review soon, especially if the lump is enlarging, tender, crusted, or repeatedly bleeding. Do not squeeze it or try to remove the centre at home. Treatment is selected after examination and pathology; options may include [Curettage And Cautery](/treatments/surgical-dermatology/curettage-and-cautery/) or [Surgical Excision](/treatments/surgical-dermatology/excisional-surgery/), depending on the site, size, borders, and diagnostic findings.

Seek prompt care for rapid enlargement, persistent bleeding, increasing pain, pus, spreading redness, or a lesion near the eye, nose, mouth, or a joint. A new firm lump that does not settle also merits review. Urgency reflects the need to identify and treat the lesion, not certainty about what it is.

Ask whether the growth needs a biopsy or complete excision, how its borders will be assessed, and which approach best protects nearby skin. Ask how the wound will heal, whether another procedure could be needed, and what change should trigger reassessment.