Tip of penis irritated for over 3 months after unprotected sex.

3 months ago I had unprotected sex next morning I woke up to a red dot on my testicles the day after the red dot disappears. The following days my penis head becomes discolored and the opening of my penis becomes irritated with 2 skin color bumps they dont burn there wasnt any discharge or smell. my std test came out negative for everything i havent checked for herpes yet. Doctor gave me ointment for a yeast infection and cortizone 1%, didnt do anything but it also didnt make it anyworst. If I touch myself itll become a darker shade of red and the area swells up. Any ideas on what it can be any info will help thankyou.

When they're raised/visible, get a doctor to check them out.

Hi I would say it leans towards a yeast infection that just does not want to say Bye Bye yet, try this cheap and simple way, Coconut oil you don't need much as a little goes a long way, start massaging it into your penis head 3 to 4 times a day give it a couple of weeks and see how it goes, get some down your urethra  as well.