Keratoacanthoma

A keratoacanthoma is a squamoproliferative tumour that presents as a nodule with a central keratotic plug, mimicking a squamous cell carcinoma (SCC) clinically. It is controversial whether keratoacanthoma is a variant of SCC or a separate entity. See here for photos of keratoacanthoma. Keratoacanthomas grow rapidly over a few weeks; in some cases, growth may be followed by spontaneous regression. Very early keratoacanthoma lesions can be mistaken for solitary lesions of folliculitis or other inflammatory lesions. Treatment is complete surgical excision. Follow up as for invasive SCC (see here).