A young adult shows up at a free clinic complaining of painful swellings in the groin. The young woman has a history of occasional casual sex, but denies noticing any genital sores or experiencing painful urination. The young woman is most likely infected with

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Painful swellings in the groin are a common symptom of lymphogranuloma venereum (LGV), which is caused by Chlamydia trachomatis. While Neisseria gonorrhoeae can also cause painful urination and genital sores, it is less likely to cause swollen lymph nodes in the groin. Mycoplasma hominis and Trichomonas vaginalis are not associated with lymphadenopathy, and Treponema pallidum, the causative agent of syphilis, typically presents with painless sores and rash.

A Young Adult Shows Up at a Free Clinic Complaining