A while ago I had red circular spot on the head of my penis. It wasn't perfectly round and there was nothing in the middle, just like a red circular outline. I noticed it about an 2 hours after I had sex (I had a condom on). It went away within a couple of days as well, just got lighter in color until it was gone. It wasn't scabby at all or anything and the skin looked fine except for the color of the affected part. Can anyone help me with this. I'd appreciate it very much.