So a few days ago i came home from school and went to the toiled. On the back of my penis i saw a white spot. I decided to wait for a day or two and see weather or not it would go away by itself, but it didn't. So now i'm sitting here worried out of my mind, wondering what it is. It isn't itchy, doesn't hurt or anything like that and its appearance reminds me of a scar (i have never had a wound there so it can't be one). By the way i'm nearly 17 if it matters at all.
Here is a link to a picture of how it looks: http://imgur.com/ub221Rp