I'm 33 years old, and this just started happening in the past year or so. When I get a cold (usually symptoms of coughing, congestion, etc.) my penis sometimes develops a rash on the head an upper shaft. If I scratch it enough, it becomes raw. The rash usually results in the skin eventually flaking off/peeling once the rash/cold runs it's course (1-2 weeks).
Is this some sort of herpes or something? It's not like little bumps, but more of a broad area that gets reddish/purplish. One time it happened I suspected it was from receiving oral sex with too much suction (in other words, I thought it was a bruise/hickey), but I have had it again since, an the correlation I am making is that it comes when I get a cold or sinus infection.
I'm also married and have not had any sort of affair. Wife and I use condoms as our form of birth control, so I doubt she gave it to me (she has no such rash or anything either).
At first I thought it was related to Psoriasis since I've had that in the past, but this is quite different than the raised, rough skin that you get from psoriasis.