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It is not the same as onychophagia, where the nails are bitten or chewed, or dermatillomania, where skin is bitten or scratched. 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.
In order to better understand excoriation disorder, researchers have developed a variety of scales to categorize skin-picking behavior. These include the Skin-Picking Impact Scale (SPIS), and The Milwaukee Inventory for the Dimensions of Adult Skin-picking.
Self-harm behaviours, including biting, hitting, head banging, and skin picking, are very common. Behavioral complications in Smith-Magenis syndrome are thought to be worsened by issues with sleeping. [5] Repetitive self-hugging is a behavioral trait that may be unique to Smith–Magenis syndrome.
Angular cheilitis – a fissure running in the corner of the mouth with reddened, irritated facial skin adjacent. A fairly mild case of angular cheilitis extending onto the facial skin in a young person (affected area is within the black oval).
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.
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.
Paresthesia refers to a burning or prickling sensation that is usually felt in the hands, arms, legs, or feet, but can also occur in other parts of the body. The sensation, which happens without warning, is usually painless and described as tingling or numbness, skin crawling, or itching.
Habit-tic deformity is caused by long-term external trauma to the nail matrix as a result of skin-picking around the affected nail. The underlying cause is habitual skin picking as a body-focused repetitive behavior which often worsens during times of stress, boredom, or inactivity.
Trichotillomania may lie on the obsessive-compulsive spectrum, also encompassing obsessive-compulsive disorder (OCD), body dysmorphic disorder (BDD), nail biting (onychophagia) and skin picking (dermatillomania), tic disorders and eating disorders.
The main mental-health difficulties experienced by people with PWS include compulsive behaviour (usually manifested in skin picking) and anxiety. Psychiatric symptoms, for example, hallucinations, paranoia and depression, have been described in some cases and affect about 5–10% of young adults.