I had unprotected sex with my partner, I was worried at first cos my menstruation just finished and I read there was a possibility that a person could get STD even though they are both clean. I noticed a little red bump under my lip but I dont feel anything bout it although it kinda looked like a pimple it doesnt seem a pimple for me. The next day my shoulder is itchy then I checked there were two little circles, I'm not sure if its blisters but I'm very afraid and worried it this thing grows. So help me out guys, how to prevent or heal it?