Multiple painful genital ulcers = HSV

Painless ulcer and painless lymphadenopathy= Syphilis

Painless ulcer and painful lymphadenopathy= LGV

Painful ulcer and painful lymphadenopathy= Chancroid

Differential diagnosis:

• Genital herpes
• Syphilis
• Chancroid is a tropical disease caused by Haemophilus ducreyi
• Lymphogranuloma venereum (LGV) is caused by Chlamydia trachomatis

Other causes of genital ulcers

• Behcet's disease
• carcinoma
• granuloma inguinale: Klebsiella granulomatis