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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.
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 gesture is typically made with the hand and fingers curled and the thumb thrust between the middle and index fingers. This gesture is also used similarly in Indonesia, Turkey, Korea, China, Mongolia, Hungary (called "fityisz"), South Slavic countries (shipak/šipak) and Romania ("ciuciu").
Yubitsume (指詰め, "finger shortening") or otoshimae is a Japanese ritual to atone for offenses to another, a way to be punished or to show sincere apology and remorse to another, by means of amputating portions of one's own little finger.
Nail biting, also known as onychophagy or onychophagia, is an oral compulsive habit of biting one's fingernails. It is sometimes described as a parafunctional activity, the common use of the mouth for an activity other than speaking, eating, or drinking.
Bare-knuckle boxing (also known as bare-knuckle or bare-knuckle fighting) is a full-contact combat sport based on punching without any form of padding on the hands.
Nail clubbing, also known as digital clubbing or clubbing, is a deformity of the finger or toe nails associated with a number of diseases, mostly of the heart and lungs. When it occurs together with joint effusions, joint pains, and abnormal skin and bone growth it is known as hypertrophic osteoarthropathy.
Jammed finger is a colloquialism referring to a variety of injuries to the joints of the fingers, resulting from axial loading beyond that which the ligaments can withstand. Common parts of the finger susceptible to this type of injury are ligaments, joints, and bones.
The little finger or pinkie, also known as the baby finger, fifth digit, or pinky finger, is the most ulnar and smallest digit of the human hand, and next to the ring finger.
Acrocyanosis is persistent blue or cyanotic discoloration of the extremities, most commonly occurring in the hands, although it also occurs in the feet and distal parts of face. [1] [2] [3] [4] Although described over 100 years ago and not uncommon in practice, the nature of this phenomenon is still uncertain. [5]