Cutaneous Nodules Arranged in a Sporotrichoid Distribution Over the Lower Extremity

摘要

Keratoacanthoma is a relatively common, low-grade cutaneous tumor that most commonly exhibits a self-limiting behavior. The lesions present as firm, sharply defined nodules with a central ulceration or prominent keratin plug. Pertinent physical findings are usually limited to the skin, with the majority of the lesions favoring the sun-exposed areas [ ].