Keratoacanthoma is a skin lesion that erupts in sun damaged skin, rather like a little volcano. It grows for a few months, then may shrink and resolve by itself. Keratoacanthoma is considered to be a variant of the keratinocytic or non-melanoma skin cancer, squamous cell carcinoma (SCC). As it cannot be clinically reliably distinguished from more serious forms of skin cancer, keratoacanthomas are usually treated surgically.