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Differential considerations.
| Cause | Disorder |
|---|---|
| Microangiopathy | DM, necrobiosis lipoidica |
| Metabolic | Gout, calciphylaxis cutis, pyoderma gangrenosum |
| Vasculitis | PAN, Wegener's granulomatosis, cryoglobulinaemia, SLE |
| Haematologic | Sickle cell anaemia, thalassemia |
| Other | Impetigo bullosa, erysipelas, osteomyelitis, antiphospholipid syndrome, lupus anticoagulans |
DM, diabetes mellitus; PAN, polyarteriitis nodosa; SLE, systemic lupus erythematosus.
