I have dermatotillomania - skin picking. It drives my boyfriend crazy...he's started slapping my hand when he sees me doing it. I do it mostly on my face, but also on my back and a little on the scalp. When I was little bit my fingernails and all the skin off the tips until they would bleed. Then I started biting the inside of my cheeks, I still do that as well. It's frustrating, I don't know how to stop and I can't explain the impulse to do it to someone who doesn't suffer and understand...