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[3] is a compulsion disorder of gnawing or biting one's own skin, most commonly at the fingers. This action can either be conscious or unconscious [4] and it is considered to be a type of pica. Those affected with dermatophagia typically bite the skin around the nails, leading to bleeding and discoloration over time.
Autophagia is the practice of biting/consuming one's body. It is a sub category of self-injurious behavior (SIB). [1] Commonly, it manifests in humans as nail biting and hair pulling. In rarer circumstances, it manifests as serious self mutilative behavior such as biting off one's fingers. [2] Autophagia affects both humans and non humans. [3]
Dermatophagia – extreme nail biting / biting of skin to point of an obsessive–compulsive disorder (OCD) [1] or other condition leading to self mutilating behaviour such as autistic spectrum disorders [citation needed] (as is the case in this example) or Lesch-Nyhan Syndrome.
Stereotypic movement disorder (SMD) is a motor disorder with onset in childhood involving restrictive and/or repetitive, nonfunctional motor behavior (e.g., hand waving or head banging), that markedly interferes with normal activities or results in bodily injury. [1]
Nail biting, also known as onychophagy or onychophagia, is an oral compulsive and unhygienic habit of biting one's fingernails. It is sometimes described as a parafunctional activity , the common use of the mouth for an activity other than speaking, eating, or drinking.
Stimming has many forms, some quite adaptive and others maladaptive (for example, excessive hand-wringing can injure joints, and excessive rubbing or scratching of skin can injure it). Another form of self-treatment that arises not uncommonly is self-medication , which unfortunately can lead to substance use disorders such as alcohol use disorder .
This gesture is most commonly used to refuse giving of aid or to disagree with the target of gesture. Usually it is connected with requests for a financial loan or assistance with performing physical work. The gesture is typically made with the hand and fingers curled and the thumb thrust between the middle and index fingers.
The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) [5] classifies the condition under "Other Specified Obsessive-Compulsive and Related Disorder" (300.3) as a body-focused repetitive behavior; the DSM-5 uses the more descriptive terms lip biting and cheek chewing (p. 263) instead of morsicatio buccarum.