I'm 17, i have always cleaned my penis, but never really strectched the foreskin. And just masturbated with the foreskin over the end. Recently, i have been getting small cuts, kind of like paper cuts on the tip of the foreskin, probably from streching/masturbating without lube.
Hey bud, you might try adding some lube to see if that helps. YOu may also want to stretch the foreskin a bit and see if that will help it move freely and easily up and down the shaft. As to those cuts, try a bit of neosporin or other antibiotic ointment to help the healing. Until they are better you might want to lay off on the masturbation or anything sexual. There are posts from me about help with stretching.
this can be a sign of an infection. You should have it checked out by a foreskin-friendly doctor. If the small cuts continue, they can make you unable to pull your foreskin back.
I think I have heard, but don't actually know, that baby diaper cream with zinc oxide will fix this.