- Exposure to a medication known to cause vasculitis (many)
- Penicillins, cephalosporins, allopurinol, dilantin, levimasole (used to cut cocaine), others
- If ulcers/ischemia:painful distal extremities, in particular→ fingers, ears, nose
- Can have systemic sx if affects multiple organs (e.g. kidneys)
- Decreased cap refill distally
- Purpuric skin lesions (typically palpable)