 Trichotillomania TTM is a disorder in which people compulsively pull out their own hair. Treatments for TTM sometimes do not have long-term effectiveness. Acceptance and commitment therapy ACT is a therapeutic approach thought to have longer lasting effects than standard cognitive behavioral therapy CBT approaches, because ACT focuses on accepting thoughts and behaviors as opposed to changing them. Previous research indicates that a combination of ACT and habit reversal behavioral therapy is more effective than no treatment. This study will test whether a combination of ACT and behavioral therapy, called acceptance enhanced behavioral therapy AEBT, is more effective than the current standard treatment for TTM. 