Partial ring of red skin just below the head of my penis. it doesn't itch or hurt at all. no stds.im circumsized. irritation from masturbation? other?

Foreskin Foresight: That's probably the margin where the foreskin was removed during your briss...mazel tov...So any kind of repeated friction could irritate that area. Yes possibly from masturbation,rough sex,a bottle of herring,an empty milk bottle,a sock,a baseball mitt or even a piece of liver(just ask Portnoy).I wouldn't worry too much unless it gets infected & hurts a lot. In that case, I'd lay off the herring.