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Primary Cutaneous Non-palpable Purpura:

• Trauma, solar purpura, steroid purpura capillaritis, livedoid vasculitis (combination of a vasculopathy with intravascular thrombosis found in assoc. with painful ucer in leg)

Systemic Non-palpable Purpura:

1. Thrombocytopenia, abnormal platelets, or clotting factor disorders.
2. Vascular frgility: amyloidosis, Ehlers-Danlos synd, survy
3. Thrombi: DIC, monoclonal cryoglobulinemia, TTP, warfarin reaction.
4. Emboli: cholesterol, fat.
5. Possible immune complex: Waldenstrom's hypergammaglobulinemic purpura, autoerythrocyte sensitization - Gardner-Diamond synd.

Systemic Palpable Purpura:

1. Vasculitis:
   Leukocytoclastic/allergic vasculitis, Henoch-Schonlein purpura, polyarteritis nodosa.
2. Emboli: acute meningococcemia, disseminated gonococcal infection, Rocky mountain spotted fever, ecthyma gangrenosum (Pseudomonas, Klebsiella, E.Coli, Serratia)

REF: Harrison Textbook