| Connective tissue diseases |
| Rheumatoid arthritis |
| Reactive arthritis |
| Systemic lupus erythematosus |
| Relapsing polychondritis |
| Systemic vasculitides |
| Granulomatosis with polyangiitis (Wegener's) |
| Microscopic polyangitis |
| Churg-Strauss syndrome |
| Polyarteritis nodosa |
| Cogan's syndrome |
| Behçet's syndrome |
| Urticarial vasculitis |
| Infections |
| Syphilis |
| Tuberculosis |
| Lyme disease |
| Herpes zoster |
| Aspergillis |
| Other |
| Sarcoidosis |
| Inflammatory bowel disease |