Keratoacanthoma

Keratoacanthoma. Keratoacanthoma is a benign, but rapidly growing skin tumour. Typically the base is surrounded by an epithelial collar and the central part forms a quite prominent hyperkeratotic mass. The histopathological differential diagnosis between keratoacanthoma and squamous cell carcinoma is difficult, if not even impossible. Excision or cryosurgery with liquid nitrogen are useful therapeutic alternatives.

Picture: Raimo Suhonen