Koebner's Phenomenon in Childhood Henoch-Schönlein Purpura: A Report of Two Cases.

Koebner's phenomenon occurs rarely in connection with Henoch-Schönlein purpura (HSP). We report two children with HSP who developed Koebner's phenomenon on the second day after the onset of rash. The first was an 11-year-old girl with rheumatic heart disease who presented with abdominal pain for 1 month and subsequently developed rash and nephritis. The second patient was a 7-year-old girl who presented with rash and polyarthritis. To the best of our knowledge, Koebner's phenomenon in childhood HSP has not been reported.