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Differential diagnosis
| Disorder | Different from EM |
|---|---|
| Urticaria | Itching is more severe. Each lesion usually disappears within 24 hours. Dermographism rubrum occurs. |
| Systemic Lupus Erythematous | Systemic symptoms occur (renal, arthritic etc) Laboratory findings of antinuclear antibodies, etc. EM sometimes occur in SLE |
| Bullous Pemphigoid | Direct/Indirect immunofluorescence reveals antibodies against basement membrane. |
| Acute Herpetic stomatitis | Ulcers are smaller with regular borders. |
