Table 1 Differential diagnosis [1, 3, 8]

Infectious

 • Syphilis

 • Chancroid

 • Herpes simplex

 • Granuloma inguinale

 • Lymphogranuloma venereum

Non-infectious

 • Crohn’s disease

 • Aphthous ulcer

 • Behçet’s disease

 • Factitial dermatitis

 • Wegener’s granulomatosis

 • Leukocytoclastic vasculitis

 • Pyoderma gangrenosum

Malignancy

 • Squamous cell carcinoma

 • Basal cell carcinoma

 • Sarcoma