Differential diagnosis of hemorrhagic bullae5,10
| Immune-mediated | Leukocytoclastic vasculitis |
| Atypical bullous pemphigoid | |
| Drug-induced bullous pemphigoid | |
| Epidermolysis bullosa acquisita | |
| Pemphigus vulgaris | |
| Paraneoplastic pemphigus | |
| Bullous pyoderma gangrenous | |
| Blood-based | Henoch–Schönlein purpura |
| Porphyria cutanea tarda | |
| Drug-or toxin-mediated | Hemophilia |
| Heparin-induced skin necrosis | |
| Warfarin necrosis | |
| Infectious | Hemorrhagic spider bites |
| Necrotizing fasciitis | |
| Mechanical | Bullous hemorrhagic cellulitis |
| Varicella-zoster virus | |
| Friction blood blisters |