ANAPHYLACTOID PURPURA - This relatively rare disorder is characterized by skin purpura, joint pains, abdominal pain, and renal disease (glomerulonephritis). Although Henoch-Schonlein purpura, or anaphylactoid purpura, is thought to be a immune complex mediated disease, it's exact cause is unknown. It's typical benign coarse can, however, include renal failure.