<prompt> The most common leukocytoclastic vasculitis affecting children isTakayasu diseaseMucocutaneous lymph node syndrome. Kawasaki diseaseHenoch Schonlein purpuraPolyarteritis nodosa  <response>: Leucocytoclastic vasculitis-It is a cutaneous acute vasculitis characterized clinically by palpable purpura especially of the legs and histologically by the presence of leucocytoclasts Leucocytoclasts are nuclear debris of neutrophilsCauses of leucocytoclastic vasculitis: -Drug-induced vasculitis Henoch schonlein purpura Systemic lupus erythematosis Rheumatoid arthritis Sjogrens syndrome Essential mixed cryoglobulinemia SABE EBV infection HIV infection Chronic active hepatitis Ulcerative colitis Retro peritoneal fibrosis Primary biliary cirrhosis 