Red And White Marks On Penis Shaft. Had Unsafe Sex. Help?

Hi doctor, I hav recently been to Thailand, I was in Australia before that for 2 years. and had sex with a local girl with condom, but condom broke, i was very annoyed as I am careful with this, so I was exposed for 10 seconds. The girl promised she was clean and all good. I also had unprotected oral sex 3 times wth 3 different girls out there and maybe could be my big concern, I am back 3 weeks now to Ireland, and since I hav got back i got tonsilitis so im on antibiotics for that, and i also hav this red/white mark on the shaft of the penis half way between testicles and tip of penis. its a little stingy if i press on it. So you can imagine im very parannoyed about this. Can u help me please. My own GPseen it and said he wasnt sure, but to go to sti clinic next tuesday.