vaginapagina | sore painful bump

i keep getting these sore bumps near my vagina. it's always been in my bikini area, like where the legs and crotch meet and it makes it difficult to walk or move in certain ways. it starts off as just a painful bump under the skin (only noticeable because it hurts so damn much) then usually the sores drain/bust and go away within a few days. it pusses, then bleeds a bit. if i continually irritate it (by chafing or something), it doesn't heal right away.. just bleeds and tries to scab. i've noticed that they usually spring up after i shave and/or when i wear tighter underwear or underwear that have some kind of trim around the legs. it's usually only one bump, but there have been times when i had a couple bumps at one time. it's pretty soft i guess, there seems like a sack of liquid above a hard something or other. this last one sprang up yesterday after wearing tight underwear and a huge maxi pad for less than a day because of my clotting issues. and i've had pelvic exams with bumps like this before and the doctor has never said anything, so i never thought to worry. SO.. what's it sound like to you guys?

i'm under the impression that it's a cyst and not genital herpes or warts because i've been getting them for a long time and it's never been more than a couple at a time. but i am a little concerned because it COULD be one of the latter. it never started until i became sexually active - when i was molested by a man who was taking cancer medication - and he never used protection. i've always wondered if that could have something to do with it, but it's not exactly something i can ask just anyone. i just remember reading one of the medication bottles and it saying something about not having sex without protection because of the risk of birth defects (mutations, really) if pregnancy occurs. so i kinda wonder what it could have/did do to me.

excuse my train of thought if it's hard to follow. i'm half dead and i can't even sleep decently with this thing.