I have lacerations on the under-skin of my penis,(when i pull it back), as in not circumcised.?

I've been getting more and more, and now it's nearly all the way around the penis. They appear as soon as i pull the skin down which is really annoying when trying to use the restroom. They sting, on a scale of 1-10, a 3, but the fact is that they sting. I'm not sexually active so i don't know what the problem is??