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In children nail biting most typically co-occurs with attention deficit hyperactivity disorder (75% of nail biting cases in a study), and other psychiatric disorders including oppositional defiant disorder (36%) and separation anxiety disorder (21%). It is also more common among children and adolescents with obsessive–compulsive disorder.
After some time, the repeated biting leaves the skin discolored and bloody. People with dermatophagia chew their skin out of compulsion, and can do so on a variety of places on their body. [8] Those with dermatophagia typically chew the skin surrounding their fingernails and joints.
Also known as "true" leukonychia, this is the most common form of leukonychia, in which small white spots appear on the nails. Picking and biting of the nails are a prominent cause in young children and nail biters. Besides parakeratosis, air that is trapped between the cells may also cause this appearance. [5]
Now that's scary! Biting your nails is no picnic for your teeth, either. "Constant biting can lead to poor dental occlusion," says Richard Scher, M.D., an expert in nail disorders, "so the...
Autophagia refers to the practice of biting/consuming one's body. It is a sub category of self-injurious behavior (SIB). 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. Autophagia affects both humans and non humans.
The prevalence rates in children having been reported as high as 61% in India, 50% in England, 39% in Thailand, 37% in Sweden, and 29% in Denmark. Finger sucking has been shown to increase both incidence and relapse rates, and nail biting has been similarly associated.