In my experience, its really hard to stop self harming. I believe it can be done. I'm not there yet, but I'm working on it. It must be hard because it is on your face. I've cut my temple before, mostly in an attempt to stop the excruciating migraines (didn't work by the way) but that's about it. My then therapist kind of really got on me about cutting my temple. I'm not sure but the way you described it sort of sounds like an OCD thing. I have a nephew with OCD and it used to be really difficult for him to control his behaviors. Oddly enough he found a lot of relief by doing karate. It helped him find some inner balance. Just thought I would throw that out there. Maybe it would help.