I am 18 years old, and have had unprotected intercourse with one girl only once, but she has had intercourse with many other guys. I have noticed for a few months now, a red splotch of skin on the head of my penis which doesn't feel different from the rest it. I notice it most often after I masturbate, rarely during, but often several hours to a day after masturbation. It seems to fade away if I do not touch myself for a few days, though perhaps it's just that I do not see it as often. What might this be?
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