Ok about 3 months ago, Me and a girl gave each other unprotected oral sex. Stupid I know and about 7 days after I noticed a tiny red dot on teh tip of my penis which dissapeared. I then had an actual rash underneath the foreskin which was there for a few days then dissapeared then came back every few days. Then when it had gone my skin went dry and flaked on the tip of my penis when I got an erection but would all come off in the shower. I've also had very sore testicles constantly and an itch under my scrotum.
I've been for 2 STD/STI tests the first was for chlamydia and ghonorea, the second time was for everything however I urinated an hour before instead of 2 hours and both tests came back negative. I am really paranoid that urinating to early has caused the test to come back negative.
I've been the doctors and he didn't have a clue to be honest and has booked me in for a ultra sound anyone any ideas on this?