Frictional lichenoid eruption in children. Recurrent pityriasis of the elbows and knees.
D002648:Child; D002675:Child, Preschool; D004550:Elbow; D006801:Humans; D007717:Knee; D010915:Pityriasis / Q000209:etiology*; D012867:Skin / Q000293:injuries*; D012871:Skin Diseases / Q000209:etiology*