Type 2 segmental manifestation of disseminated superficial actinic porokeratosis in a 7-year-old girl.

We report here a rare case of porokeratosis in which two different clinical types of porokeratosis (linear porokeratosis and disseminated superficial actinic porokeratosis) coexisted. A 7-year-old girl developed a centrifugal lesion on her left abdomen at the age of 2, disseminated superficial actinic porokeratosis on her face at the age of 3 after ultraviolet exposure, and linear porokeratosis on her left body at the age of 5. Histological findings corresponded with cornoid lamella. She was treated with topical maxacalcitol ointment and cryotherapy with considerable improvement. The combination of different types of porokeratosis in one individual is rare. We consider that this case may represent a type 2 segmental manifestation of disseminated superficial actinic porokeratosis.