I have a white bump between my vagina and anus. I've had it for a couple months but I didn't think much of it at first because it had been there a while and hadn't spread or anything but it gets smaller sometimes and bigger other times. I don't notice a pattern of any sort either. It doesn't change with my menstrual cycle or after sex or any of that fun stuff. There is only one. It doesn't hurt but I just got out of the shower and noticed it was bigger than I have seen it in the past. Could this be an STD?? I have also had what I assumed to be cysts in the past(both when I was a virgin and shortly before this appeared). Could it just be a cyst?