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| Fig. 44.4 Keratoacanthoma demonstrating a crateriform nodule with central keratin plug. (Courtesy of James E. Fitzpatrick, MD.) |
Keratoacanthomas are usually easy to recognize. They appear suddenly, typically on sun-exposed skin, as skin-colored domes that develop a central keratin-filled plug (Fig. 44-4). They grow quickly, often over the course of weeks, and usually reach a size of 1 to 2 cm before regressing. Rarely, they may attain a size of 5 cm or more (giant keratoacanthomas).
