TABLE 2.
Differential diagnosis of pyoderma gangrenosum
| Infections | Bacterial |
|---|---|
| Mycobacterial | |
| Fungal: Sporotrichosis, aspergillosis, cryptococcosis | |
| Parasites | |
| Viral: Herpes simplex | |
| Cutaneous primary tumours/metastasis | Skin lymphoma |
| Mycosis fungoides bullosa | |
| Langerhans cell histiocytosis | |
| Sickle cell disease | |
| Haematological causes | Cryoglobulinemia |
| Anti‐phospholipid syndrome | |
| Vascular Occlusive Disease | Livedoid vasculopathy |
| Venous stasis ulceration | |
| Small vessel occlusive arterial disease | |
| Type 1 cryoglobulinemia | |
| Anti‐phospholipid syndrome | |
| Autoimmune diseases with vasculitis | Systemic lupus erythematous |
| Behcet's disease | |
| Wegener granulomatosis | |
| Polyarteritis nodosa | |
| Pyoderma vegetans | |
| Munchausen syndrome and factitious disorder | |
| Drug‐induced and exogenous tissue injury | Hydroa‐induced ulceration |
| Bromoderma | |
| Drug‐induced lupus | |