The incidence of many skin diseases peak in adulthood, and these disorders may be difficult to recognize when they do present in childhood. Their clinical features may be distinct in pediatric patients, and they may be managed differently in children as compared to adults. Therefore, it is important that dermatologists are able to identify "adult" skin disease in the pediatric patient, and know how to appropriately manage these problems in young patients. The epidemiology, clinical features, differential diagnosis, and management of the following "adult" skin diseases in children are reviewed: psoriasis, lichen planus, rosacea, Sweet's syndrome, and mucosis fungoides. Distinctive features of lichen sclerosus and immunobullous diseases in childhood will also be briefly discussed.