DDx ⬇
- Venous insufficiency
- Arterial insufficiency (arterial ulcer)
- Stasis dermatitis (due to venous insufficiency)
- Diabetic neuropathy
- Bacterial pyoderma (eg, infected wound or bite)
- Trauma
- Pressure ulcer
- Vasculitis, eg, thromboangiitis obliterans (Buerger’s disease)
- Rheumatoid arthritis or Felty’s syndrome
- Pyoderma gangrenosum
- Underlying skin cancer
- Sickle cell anemia
- Embolic disease (including cholesterol emboli)
- Cryoglobulinemia
- Erythema induratum (associated with tuberculosis)
- Other underlying infection (eg, fungal, tertiary syphilis, leishmaniasis, amebiasis, dracunculiasis)
- Calciphylaxis
Related DDx ⬆