...A disorder that causes people to pull out the hair from their scalp, eyelashes, eyebrows, ... [arms]... resulting in noticeable bald patches. Hair pulling varies greatly in its severity, location on the body, and response to treatment. For some people, at some times, [it's] is mild and can be quelled with a bit of extra awareness and concentration. For others, at times the urge may be so strong that it makes thinking of anything else nearly impossible.
...currently defined as an impulse control disorder but there are still questions about how it should be classified. It may seem to resemble a habit, an addiction, a tic disorder or obsessive-compulsive disorder. Most recently, it is being conceptualized as part of a family of "body-focused repetitive behaviors" (BRFBs)...
from TLC
