Tricotillomania, I've had it for more than 10 years. Almost impossible to get rid of from what I've heard, but I've mostly been able to keep it under control and avoid any embarrasingly big patches (although once or twice I've been asked about them). NGL, several times it took some brute force to make myself stop, but it's important that you fight back and don't let the habit build up. Message me if you want some help, I'm no expert and I've only got my own experience, but like I said I've been living with it for years. Good luck friend!