Punched-out porokeratosis. A histological variant of disseminated superficial actinic porokeratosis.

This paper describes an unusual histological variant of disseminated superficial actinic porokeratosis in which there were areas of full-thickness coagulative epidermal necrosis. The diagnosis of porokeratosis was confirmed with a further biopsy, which demonstrated a coronoid lamella and some underlying basal cell liquefaction. The significance of the pathology is discussed.