Small Rash, Irritation, On the Tip of My Penis. Help!

The other day I realized that I hadn't showered all weekend. So without haste I hopped in the shower and went on with my typical procedure working from my feet up and I realized a little red mark on the tip of my penis right below the left side(my left) of the "exit" hole. (for lack of a better term) it's not prominent, doesn't stick out. There's no sores (like herpes), it's a little dry and the skin is a little white from very minor peeling. (i also have a nickle allergy. My belt tends to break out my stomach. Nothing big, just a little irritation.)

i've only been sexually active a few times. And with a girl who's never done anything, so i'm sure everything's fine.

Anyway, I flipped out. I cleaned it and did everything and proceeded to examine it after the shower. I went to school and it checked it every so often. There's no burning, no pain, no discharge or anything. I'm just supposing it's a fungal irritation from not showering for a day or two. I've only seen this for a day and if it's still there at the end of the week i'll be seeing a doctor.

If you have any ideas lemme know.

Thanks so much! :d