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Those affected with dermatophagia typically bite the skin around the nails, leading to bleeding and discoloration over time. Some people also bite on their skin on their finger knuckles which can lead to pain and bleeding just by moving their fingers.
Compulsive picking of the knuckles (via mouth) illustrating potentially temporary disfiguration of the distal and proximal joints of the middle and little fingers. The fingers have been compulsively picked and chewed in someone with excoriation disorder and dermatophagia .
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. Body-focused repetitive behavior ( BFRB) is an umbrella name for impulse control [1] behaviors involving compulsively damaging one's physical ...
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 .
The caption to the photo states that the person damaged the knuckles "via the mouth" - which presumably means biting or chewing, not picking with the fingers (hence the label dermatotillomania seems inappropriate). I have exactly the same calluses on my knuckles from nervous chewing of my fingers - and I understand that to be dermatophagia.
Russell's sign, named after British psychiatrist Gerald Russell, is a sign defined as calluses on the knuckles or back of the hand due to repeated self-induced vomiting over long periods of time. The condition generally arises from the patient's knuckles making contact with the incisor teeth during the act of inducing the gag reflex at the back ...
Midphalangeal hair, or the presence/absence of hair on the middle phalanx of the ring finger, is one of the most widely studied markers in classical genetics of human populations. Although this polymorphism was observed at other fingers as well, for this kind of research, the fourth finger of the hand has been conventionally selected.
The metatarsophalangeal joints ( MTP joints) are the joints between the metatarsal bones of the foot and the proximal bones ( proximal phalanges) of the toes. They are analogous to the knuckles of the hand, and are consequently known as toe knuckles in common speech.
Metacarpophalangeal joint. The palmar aspect of the hand showing the epiphyses of the hand exploded. MCP joints in red. The metacarpophalangeal joints ( MCP) are situated between the metacarpal bones and the proximal phalanges of the fingers. [1] These joints are of the condyloid kind, formed by the reception of the rounded heads of the ...
Dermatographic urticaria is sometimes called "skin writing", as it is possible to mark deliberate patterns onto the skin. The condition manifests as an allergic-like reaction, causing a warm red wheal to appear on the skin. As it is often the result of scratches, involving contact with other materials, it can be confused with an allergic ...