Frictional lichenoid dermatitis, also known as frictional lichenoid eruption and juvenile papular dermatitis, is a recurring eruption that usually affects children, especially boys, aged 4-12 years. It is thought to arise from friction on the skin from playground activities or sports and is more frequently seen in the spring or summer, when outdoor activities are at their peak. Around one-half of cases are seen in children with an atopic diathesis, including those with atopic dermatitis, asthma, or allergic rhinitis.

Clinically, frictional lichenoid dermatitis appears as tiny lichenoid papules over the knees, elbows, and dorsal hands. The condition is usually asymptomatic, but pruritus may be present and is sometimes severe.