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Dermatophagia (from Ancient Greek δέρμα — lit. skin and φαγεία lit. eating) or dermatodaxia (from δήξις, lit. biting) [3] is a compulsion disorder of gnawing or biting one's own skin, most commonly at the fingers.
Chewing fingers (in extreme cases, leading to amputation) Possible causes. This section will focus on the causes for autophagia in humans. There is no single primary cause for autophagia. Due to limited medical research which differentiates autophagia from typical nail biting practices, the causes of autophagia remain broad.
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.
Signs and symptoms. Nail biting may lead to harmful effects to the fingers, like infections. These consequences are directly derived from the physical damage of biting or from the hands becoming an infection vector. Moreover, it can also have social consequences, such as withdrawal and avoiding handshakes.
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.
Russell's sign. Causes. The most common causes of Russell’s Sign are bulimia and anorexia nervosa. Diagnostic method. Russell's Sign can be used as a factor to diagnose bulimia nervosa or anorexia nervosa. Differential diagnosis. indirect sign of bulimia nervosa or anorexia nervosa. Deaths.
Besides parakeratosis, air that is trapped between the cells may also cause this appearance. It is also caused by trauma. In most cases, when white spots appear on a single or a couple of fingernails or toenails, the most common cause is injury to the base (matrix) of the nail.
Rat-bite fever (RBF) is a zoonotic disease. [8] It can be directly transmitted by rats, gerbils, and mice (the vectors) to humans by either a bite or scratch or it can be passed from rodent to rodent. [9] The causative bacterial agent of RBF has also been observed in squirrels, ferrets, dogs, and pigs. [10]
Signs and symptoms. The index and middle fingers are most commonly affected and may present with redness, swelling and pain. Pus or discharge may be present.