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Dermatophagia (from Ancient Greek δέρμα — lit. skin and φαγεία lit. eating) or dermatodaxia (from δήξις, lit. biting) [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.
Excoriation disorder, more commonly known as dermatillomania, is a mental disorder on the obsessive–compulsive spectrum that is characterized by the repeated urge or impulse to pick at one's own skin, to the extent that either psychological or physical damage is caused. [4] [5]
Nail biting, also known as onychophagy or onychophagia, is an oral compulsive 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. Nail biting is very common, especially amongst children. 25–35 percent of children bite ...
Onychotillomania can be categorized as a body-focused repetitive behavior in the DSM-5 and is a form of skin picking, also known as excorciation disorder. It can be associated with psychiatric disorders such as depressive neurosis, delusions of infestation and hypochondriasis. It was named by Jan Alkiewicz, a Polish dermatologist.
Lesch–Nyhan syndrome. Lesch–Nyhan syndrome ( LNS) is a rare inherited disorder caused by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRT). This deficiency occurs due to mutations in the HPRT1 gene located on the X chromosome. LNS affects about 1 in 380,000 live births. [3]
Trigeminal neuralgia ( TN or TGN ), also called Fothergill disease, tic douloureux, trifacial neuralgia, or suicide disease, is a long-term pain disorder that affects the trigeminal nerve, [7] [1] the nerve responsible for sensation in the face and motor functions such as biting and chewing. It is a form of neuropathic pain. [8]
Autophagia refers to 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 ...
Medical genetics. Case of Brachydactyly type D in both hands of a 16 year old male. Brachydactyly type D, also known as short thumb, [3] [1] stub thumb, [5] [6] or clubbed thumb, [5] [6] is a genetic trait clinically recognised by a thumb being relatively short and round with an accompanying wider nail bed. The distal phalanx of affected thumbs ...