Symptoms may develop over the course of days to weeks and vary in order of presentation
Often begins with erythematous, macular, or urticarial wheals, progressing into the typical ecchymoses, petechiae, and palpable<unk>  (see picture)
Typically appears in crops, symmetrically distributed, and located primarily in gravity/pressure-dependent areas (e.g. lower extremities, buttocks)
Typically diffuse and colicky
May have blood in the stool (massive bleeding is rare)
Migratory, usually involves knees/ankles
(~50% of the time)
Hematuria +/- proteinuria
Melena, hematemesis, hepatosplenomegaly
Headache, seizures
Fever
Non-pitting edema of the extremities and face
Nephritic range proteinuria
Long-term mortality directly related to renal involvement
Long-term mortality directly related to renal involvement
Henoch-Schonlein purpura
Emergent
Serum sickness
Necrotizing Enterocolitis
Kawasaki disease
Volvulus
Hemolytic uremic syndrome
Testicular torsion