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Dermatophagia (extreme nail-biting and biting of skin) to point of an obsessive-compulsive disorder or other condition leading to self-mutilating behavior, such as autistic spectrum disorders (as is the case in this example) or Lesch-Nyhan syndrome. (Photography by 6th Happiness on May 16, 2009. Creative Commons Attribution 3.0 Unported license. https://creativecom

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