Geek, I think that people who cut/burn etc themselves have a lot of self hate. It stems from a feeling of being an "outsider" of some sort, or carrying a burden of (likely) secret pain. When they hurt themselves, it makes them feel more real. It also makes them FEEL... anything is better than all that emotional painto them. GGG is right, this person needs HELP and is crying out for it by scarring themselves. If you or anyone you know does this, you may want to let a trusted adult know, but don't make that person feel like they are a freak for it or they will withdraw even more. PM me if you want more info since I can understand.
The capacity for passion is both cruel and divine. George Sand - 1834