Lichen sclerosus et atrophicus is ordinarily a disease of adults. It occurs most frequently in middle-aged women, although no relationship to the menopause has ever been established. The observation of 3 cases of lichen sclerosus et atrophicus in young girls within a short period is noteworthy and constitutes the basis of this report. CLINICAL FEATURES Within the past fifteen years there have been two detailed discussions in the American literature concerning lichen sclerosus et atrophicus and related disorders such as guttate morphea and atrophic lichen planus, that of Nomland1 in 1930 and that of Montgomery and Hill2 in 1940. These observers have done a good deal to clarify the utter confusion which previously existed in connection with these diseases, especially as to terminology. Montgomery and Hill were correct in urging the abandonment of the terms "white spot disease" and "card-like scleroderma of Unna" which