could be you are giving your penis a real tight grip and the dry skin doesn't help...I had a girlfriend many years ago who was masturbating me dry and it made my wee wee look like hamburger..had to leave it alone for a month or so.
My guess is stick to the lube, or if you don't have it a tight grip with no rubbing will help.
good luck!
Yes, I will give you that..odd! However, I would see a doctor right away to rule out any STD's. I would also talk to you doctor about any other skin symptoms you might be having elsewhere on your body.