Sounds like an ingrown hair. If it was herpes or warts you can contract them anywhere without having sex as long as there is contact your able to get it (legs,eyes,mouth, hands, feet back ect)
ok i will tell you this, some women get these pimple like things not on the inside but around the v hole or just in the cracks of the v area to butt, now i know they seem scary and all of that jazz cause ive had it happen before, i though omg i got a std all that jazz so i went to my doctor and my doctor told me that i didnt have a std and they where nothing bad, he said some girls get bumps down there before their periods would start and when its hot or you have sex for a while that the sick flars up down there which causes the bumps, yea dont touch them they do hurt but you have nothing to worry about but make sure you make a apointment with your doctor and talk to them about your sisuation they will tell you