hi guys, so a girl gave me oral unprotected after a drunken night out!! anyway ive got this weird red mark now which literally appeared a couple days later and hasnt gone now for like a month and its really worrying me. It is flat and there is no pain or anything. some days it looks worse than others! it can also get some whitish marks around it too at times. had full check for stds etc but everything clear... any ideas??