it's been several months since i had unprotected oral and protected vaginal sex, and seemingly from that time i've had a re-occurring rash/irritation on my penis, around the pee-hole. see the picture. it gets especially red like that when i ejaculate from masturbation, otherwise it is not so bad. after a while, the skin around that area gets dry and starts peel off. if i don't ejaculate, the rash lessens and nearly disappears. what could this be? what should i do?
thanks