Trichotillomania
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A psychological disorder characterized by the compulsive urge to pull out one's own hair, classified as an impulse control disorder.
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Mentioned once in The 1000th Show.
The 1000th Show
Season 5 · Episode 5 · S05E05
“Dr. Egmond Sandeling's recent article on Trichotilimania contains several errors. He would do well to read the groundbreaking work on the subject”