Trichotillomania falls into the category of habit and impulse disorders. In fact, it is an obsessive disorder characterized by a compelling need to pull hairs off your body, sometimes to the extent that hairs are totally removed, which can engender a significant distress and a social isolation as well as serious physical damages.
For some people, trichotillomania may be manageable. For others, the compulsion to pull hair is unrelenting. However, antidepressants and cognitive-behavioral therapy can help ameliorate the situation and lessen the trouble.