I hope you mind me chiming in here, but the condition youre describing is technically referred to as Trichotillomania, or Trichotillosis. It is an impulse control disorder, like OCD. It is usually triggered by stress or anxiety. It is often in the same category as nail bitting, compulsive scratching etc.. and is one of the many disorders often crossed as an OCD. A therapist can help you with a therapeutic treatment(cognative/behavioral-behavior reversal therapy). I would suggest removing any triggers of anxiety and see if it stops. If not, seek treatment.
-Evil