| Infection - sexually transmitted | Syphilis, chancroid, herpes simplex, lymphogranuloma venereum, donovanosis | | Infection - non-sexually transmitted | Epstein-Barr virus, herpes zoster, tuberculosis, amebiasis | | Drug eruptions | Erythema multiforme, toxic epidermal necrolysis, fixed drug eruption | | Inflammatory | Behçet's syndrome, Crohn's disease, Lipschutz ulcer, aphthae | | Trauma | Trauma, dermatitis artefacta | | Malignancy | SCC, BCC, cutaneous lymphoma, melanoma |
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