Since Sneddon and Wilkinson's original description of 6 cases of subcorneal pustular dermatosis, the number of cases reported has risen to 20.1-7From these reports a highly characteristic clinical picture emerges. In otherwise healthy persons, usually female, a recurrent, superficial pustular eruption occurs, often beginning in intertriginous areas and spreading over large areas of the integument to form gyrate and figurate patterns. As the lessions involute, superficial yellowish crusts are formed, which fall off, leaving slight hyperpigmentation and no scarring. Changes in the disease can occur rapidly so that a person relatively free of lesions can develop almost generalized pustulation in a day or two. Mouth lesions and nail dystrophies may occur. The course is chronic with exacerbations and remissions, sometimes for many years. An additional case, unusually early in onset and protracted in course, is presented here. Report of a Case History.— A 29-year-old woman was first seen