The current classification of porokeratosis includes the classic plaque type (Mibelli), disseminated superficial actinic porokeratosis, linear porokeratosis, and porokeratosis palmaris et plantaris disseminata. The clinical variants may show autosomal dominant inheritance, and the unifying histologic hallmark for the various forms of porokeratosis is the coronoid lamella. It has been proposed by some authors that zosteriform or linear forms of porokeratosis represent a distinct entity because of the earlier age of onset and the lack of family history.1
Two patients, a woman with linear porokeratosis and her father with disseminated superficial actinic porokeratosis, are described herein.
Report of Cases
A 19-year-old woman was initially seen in our clinic because of concern that a lesion on her arm was continuing to enlarge. This asymptomatic lesion had appeared on the posterolateral portion of the left shoulder at 5 years of age and had spread slowly down the extensor surface of
Moreland ME, Wyre HW. PorokeratosisTwo Morphologic Forms Within a Family. Arch Dermatol. 1981;117(4):245-246. doi:10.1001/archderm.1981.01650040061026