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Those with dermatophagia typically chew the skin surrounding their fingernails and joints. They also chew on the bottom of their feet/toes, inside of their mouth, cheeks, and/or lips, causing blisters in and outside of the mouth.
The fingers have been compulsively picked and chewed in someone with excoriation disorder and dermatophagia. Compulsive picking of the face using nail pliers and tweezers. Episodes of skin picking are often preceded or accompanied by tension, anxiety, or stress. In some cases, following picking, the affected person may feel depressed.
Biting the fingers and lips is a definitive feature of Lesch–Nyhan syndrome; in other syndromes associated with self-injury, the behaviors usually consist of head banging and nonspecific self-mutilation, but not biting of the cheeks, lips and fingers.
Body-focused repetitive behavior. Dermatillomania (picking of the skin) of the knuckles (via mouth), illustrating disfiguration of the distal and proximal joints of the middle and little fingers.
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Causes. In children the primary source of infection is the orofacial area, and it is commonly inferred that the virus (in this case commonly HSV-1) is transferred by the cutting, chewing or sucking of fingernail or thumbnail. [citation needed]
Onychotillomania is a compulsive behavior in which a person picks constantly at the nails or tries to tear them off. [1] It is not the same as onychophagia, where the nails are bitten or chewed, or dermatillomania, where skin is bitten or scratched.
In animals, autophagia tends to be restricted to the hind limbs and the lower parts of the abdomen. [3] Symptoms include chewing of limbs, paws and tails. In extreme cases the entire tail is consumed. [11] Unlike humans, the causes for autophagia in rats has not yet been determined.
Facial features of children with Smith–Magenis syndrome include a broad and square face, deep-set eyes, large cheeks, and a prominent jaw, as well as a flat nose bridge (in the young child; as the child ages it becomes more ski-jump shaped). Eyes tend to be deep-set, close together, and slanted upwards.
Russell's sign, named after British psychiatrist Gerald Russell, is a sign [1] defined as calluses on the knuckles [2] or back of the hand due to repeated self-induced vomiting over long periods of time.