I have a weird pimple on the outside of my vaginal area after sex and it hurt. what is this

I have a weird pimple-looking thing on the outside of my vaginal area after sex , it looks like a pimple, except it appears to have a red/pinkish look on the inside, rather than having pus. I'm really freaked out, I don't know what it could be, but it hurts really bad when touched, it appears 3-4 day after sex but goes away after a week, this is the second time its appearing.
Thanks in advance for the help.

That could be anything from a coincidence to a STD like herpes or syphillis. You need to see a doctor.

so sorry darling, but you have herpes. be smart don't pass it on . always use protection to the end of your life because well it only gets worst with time.

if you shaved their then most often it could just be an in-grown hair and got aggravated with sex. Hope you used protection love, if not for you sake then the child. Be safe:)