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Skin chewing can be bolstered by times of apprehension and other unpleasant events. Blisters in particular can cause a feeling of desire to pull or bite off the affected skin and nails (since the skin is dead, thus easily pulled off), which could be detrimental, causing infection .
Excoriation disorder. Other names. Dermatillomania, [1] skinning disorder, neurotic excoriation, acne excoriee, pathologic skin picking (PSP), compulsive skin picking (CSP), psychogenic excoriation [2] [3] Sores as a result of skin picking on arms, shoulders and chest. Specialty.
Skin Dermatillomania (excoriation disorder), skin picking; Dermatophagia, skin nibbling; Mouth Morsicatio buccarum, cheek biting; Morsicatio labiorum, inner lip biting; Morsicatio linguarum, tongue biting; Nails Onychophagia, nail biting; Onychotillomania, nail picking; Nose Rhinotillexomania, compulsive nose picking; Hair Trichophagia, hair ...
Often, the adjacent skin is bitten off, too, which is called perionychophagia, a special case of dermatophagia. Biting nails can lead to broken skin on the cuticle . When cuticles are improperly removed, they are susceptible to microbial and viral infections such as paronychia .
Dermatophagia – extreme nail biting / biting of skin to point of an obsessive compulsive disorder (OCD) or other condition leading to self mutilating behaviour such as autistic spectrum disorders (as is the case in this example) or Lesch-Nyhan Syndrome.
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]
Signs and symptoms. Common repetitive movements of SMD include head banging, arm waving, hand shaking, rocking and rhythmic movements, self-biting, self-hitting, and skin-picking; [1] other stereotypies are thumb-sucking, dermatophagia, nail biting, trichotillomania, bruxism and abnormal running or skipping. [3]
Other forms of pica include dermatophagia, [7] and compulsion of eating one's own hair, which can form a hairball in the stomach. Left untreated, this can cause death due to excessive hair buildup. [8] Self-cannibalism can be a form of self-harm and a symptom of a mental disorder. [4]
Dermatophagia is specifically biting. Both involve damage up to the point where you actually hurt yourself and bleed, but the compulsion doesn't go away - and the scars from both look different, in my experience. Biting scars tend to look white around the edges because of the moisture in your mouth, whereas picking scars can look callused and raw.
Morsicatio buccarum is a condition characterized by chronic irritation or injury to the buccal mucosa (the lining of the inside of the cheek within the mouth), caused by repetitive chewing, biting or nibbling.