On August 2nd, I had unprotected oral sex with a woman for about 30 secs to 1 min. Afterward I place a condom on and continued with intercourse. Two and a half weeks later I started having a burning sensation around the head of my penis and urethra. No discharge. It ll only burn after I urinate & burn afterward for some time. It s an on and off thing. On August 26, i had sex with my significant other in the morning using a vibrating rubber ring around my penile shaft, which felt alittle tight. The very next day, I woke up with a dime size looking painless bruise or rash. It has almost dissappeared by August 28th (3 days later) I m not sure what I m experiencing.. I m worried. I had ask the previous woman I ve had sexual contact with if she has anything, and she said the last partner she had sexual intercourse with was 6 months ago and she has no symptoms and have not tested for any std. So yesterday, I went to see a Doctor and he wasn t able to tell me anything. He said the bruise was probably from using the ring, and that there s no bacteria in my urine. I ve just tested for chlamydia, Gono, herpes 1 & 2, syphillis and HIV..I ve been stressing, because the burning sensation still remains, the bruise is almost gone and I ve been having slight testicle tenderness, although not too noticeable. Any help would be appreciated, thanks