i get these sometimes and it actually more common than you think. i told my doctor about them and she said it was nothing to be worried about unless they come in large groups or re-occur frequently. they are usually small cysts that get filled with puss and bacterial. take a washcloth and run in under hot water, then let it sit on the bump. usually it will pop itself and the puss with come out. it always could be an ingrown hair, especially if you shave. try not to touch it. if it doesn't go away within a week or so or if it gets larger, see your doctor to be safe.
if you have pain than i would tell see the gynecologist for safe side.Good luck