- Immune complex deposition
- Acute abdomen pain, n, v
- Sometimes bloody diarrhea, hematuria, renal impairment
- Joint pain and swelling
- Onset often preceded by upper respiratory infxn
- Palapable purpura→ don't blanch when compress them, can coalesce, in partic abd, legs, buttocks
- Sometimes blisters form
- Joint swelling and pain