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A 19yo man was seen in the ED 2 weeks ago with a painless lesion to his penis. He is sexually active with men, has had 2 recent partners, and “sometimes forgets” to use condoms. At that time testing for HIV, RPR, gonorrhea, and chlamydia urine NAT were performed at the time and he was treated empirically with IM bicillin for presumed chancre of syphilis and empiric IM ceftriaxone for gonorrhea. All of the labs were subsequently negative. He now returns with bilateral tender inflamed inguinal adenopathy. His penile lesion resolved after a few days.

What is the best treatment for his condition?