Hi im 15 and have started masterbating quite alot lately. although recently i noticed there was skin attaching my penis corona to inner foreskin and there are small tears and tunnels underneath. sorry its hard to explain.i was swimmin the otherday and when i went to toilet i pulled foreskin back to pee and  i ripped a little bit away and it didnt hurt at all but was quite worrying as i dont know why its ripping.