Russell's sign

Russell's sign, named after British psychiatrist Gerald Russell, is a sign[1] defined as calluses on the knuckles[2] or back of the hand due to repeated self-induced vomiting over long periods of time. The condition generally arises from the afflicted's knuckles making contact with the incisor teeth during the act of inducing the gag reflex at the back of the throat with their finger(s).

Russell's sign
Differential diagnosis	indirect sign of bulimia nervosa or anorexia nervosa

This type of scarring is considered one of the physical indicators of a mental illness, and Russell's sign is primarily found in patients with an eating disorder such as bulimia nervosa or anorexia nervosa. However, it is not always a reliable indicator of an eating disorder; there are many more factors associated with it.

Bulimics who are capable of "handsfree purging", or the induction of vomiting by the willful opening of the esophageal sphincter in a manner similar to belching, while contracting the stomach muscles, do not have Russell's sign.

Russell's sign is no longer commonly seen as patients tend to prefer to use objects such as pens or tooth brushes to induce vomiting.

Martial art practices include push-up exercises done with hands in fists; the support points are the big knuckles of the index and middle finger. Repeated wear in one area of skin may cause calluses to form.