Two possibilities come to mind immediately, either an infection of a hair follicle (especially common if you shave in that area) known as folliculitis, or a swollen lymph node (or gland) representing (sexually transmitted) infection elsewhere. I suppose if the hair follicle got infected enough, you might have an abscess (pocket of pus). Either way, you need to go see your family physician for appropriate testing, diagnosis & treatment. Good luck!
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