That sounds a lot like trichotillomania, the compulsive pulling out of hair. If you look at some of the other threads going on... there's one about eyelash pulling out, which is a form of the same thing... you can talk to some people who have it as well. I do have a history of self harm but trich was never anything I really went through. I do suggest talking to some other people on this board with trich. Check some of the other threads.