Why Do I Have Identical Pinkish Bumps On Both Sides Of My Vulva For A Year, Appearing After Sex Which Itch More While On Birth Control?

these pinkish bumps are identical on both sides of my vulva and they have been there for a year on and off. when i was taking birth control the itching was bad but when i stopped they didnt itch as much. I am 19 they appeared after sex i thought they were razor bumps.