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To the Editor.—
Recent letters have argued the merits of lumping vs splitting in porokeratosis (Porokeratosis, LETTERS TO THE EDITOR. Arch Derm 105:296, 1972). Here presented is some evidence for lumping.This 36-year-old woman developed a linear porokeratosis at age 5 following the measles (Fig 1). After puberty, she developed the small lesions of disseminated superficial actinic porokeratosis (DSAP) on the arms and legs, with exacerbation in the summer (Fig 2).Biopsies of both areas showed the coronoid lamella. Three of her sisters were also examined and had biopsies. They had DSAP on the extremities, with onset soon after puberty. Four brothers and a younger sister were not affected. The parents had no DSAP.
Welton WA. Linear Porokeratosis in a Family With DSAP. Arch Dermatol. 1972;106(2):263. doi:10.1001/archderm.1972.01620110087025