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November 1966

Frictional Lichenoid Eruption in Children: Recurrent Pityriasis of the Elbows and Knees

Author Affiliations


From the Department of Dermatology. University of Miami School of Medicine, Coral Gables, Fla (Dr. Waisman), and the Department of Medicine (Dermatology), University of Kansas Medical Center, Kansas City, Kan (Dr. Sutton).

Arch Dermatol. 1966;94(5):592-593. doi:10.1001/archderm.1966.01600290066011

A distinctive pityriasiform and lichenoid eruption of the extremities, particularly of the elbows and knees, occurs in children 4 to 12 years old. The lesions recur in the summer months and may be attributed to friction during play on abrasive surfaces. Sources of irritation are sandpiles, sandy beaches, rugs with short pile, upholstered furniture, and wool blankets on which the children kneel and crawl. Patients are presumed to possess a peculiar cutaneous predisposition which elicits this characteristic papular lichenification. Healing without residual changes follows avoidance of frictional trauma and treatment with mild topical medication.

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