Without seeing the lesion, it is impossible to say what it is.
There are a variety of genital lesions that are possible. Infectious etiologies of genital ulcers include: herpes, chancroid (Haemophilus ducreyi), granuloma inguinale (Calymmatobacterium granulomatis), syphilis (Treponema pallidum), HIV-specific ulcers (acute HIV infection or late HIV), and lymphogranuloma venereum (Chlamydia trachomatis).
They can be properly evaluated and diagnosed by viral cultures, gram staining or blood tests.
If the lesion is indeed herpes, then a remitting and recurring pattern would not be uncommon.
You may want to consider a referral to a dermatologist for another opinion.
Without seeing the lesion, it is impossible for me to be more specific.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
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