Well a couple weeks ago my gf gave me an unprotected blowjob and i think she used some teeth during it because a circle formed around the spot i felt her teeth and it looks like she took some skin off. I put some neosporin overtime on it and it got smaller but recently it seems to have gotten bigger and more red. I really hope it isnt an sti but i need some opinions. Looks like a red circle where skin was taken off.