It could be an absese. I'm not sure if I spelled it correctly, but it's similar to a risen. But far more painful and fluid builds up in it. I've never had one but I've heard women that have. You should go get it checked, sometimes it has to be sliced and drained in order for it to heal. Good luck Sweetie♥
I kno it sounds stupid but my frien was told by her doctor to lay in bleach water for 10 minutes one time a week
Sounds like its a mrsa bump have ur self check out for mersa .