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Dermatophagia (from Ancient Greek δέρμα — lit. skin and φαγεία lit. eating) or dermatodaxia (from δήξις, lit. biting) is a compulsion disorder of gnawing or biting one's own skin, most commonly at the fingers.
If excoriation disorder does not occur during adolescence another common age of onset is between the ages of 30 and 45. Additionally, many cases of excoriation disorder have been documented to begin in children under the age of 10.
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 .
Other forms of pica include dermatophagia, 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. Self-cannibalism can be a form of self-harm and a symptom of a mental disorder.
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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.
Disability-adjusted life year for childhood-cluster diseases per 100,000 inhabitants. These include pertussis, poliomyelitis, diphtheria, measles, and tetanus. The term childhood disease refers to disease that is contracted or becomes symptomatic before the age of 18 or 21 years old.
Children from ages 3–7 are most commonly infected with tinea capitis. Trichophyton tonsurans is the most common cause of out breaks of tinea capitis in children, and is the main cause of endothrix (inside hair) infections.
Pica is most commonly seen in pregnant women, small children, and people who may have developmental disabilities such as autism. Children eating painted plaster containing lead may develop brain damage from lead poisoning.
Dermatophytosis has been found to be most prevalent in children ages 4 to 11, infecting more males than females. Low socioeconomic status was found to be a risk factor for Tinea capitis . [32] Throughout Africa, dermatophytoses are common in hot- humid climates and with areas of overpopulation.