[Keratosis follicularis--new genetic aspects].

A hypothesis according to which two types of keratosis follicularis (below) should be differentiated is discussed with reference to clinical findings recorded during mass screening in kindergartens and in a dermatological practice: (1) condition improves, to normal in early adulthood, a type in which the for which heritability not cannot be identified by mass screening; (2) a type with growing incidence, primarily among women up to 30 years of age, caused by an X-linked dominant gene.