Genital Skin Ulcers - Differential Diagnosis Algorithm

Painful:

 • Herpes simplex

 • Haemophilus ducreyi (chancroid)

 • Behcet's syndrome

 • Pemphigus vulgaris

 • Lichen sclerosis

 • Erosive lichen planus

Painless:

 • Primary syphilis (chancre)

 • Granuloma inguinale

 • Lymphogranuloma venereum



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