trichotillomania

The word trichotillomania derives from the Greek trich- ("hair") and tillein ("to pull or pluck"), along with the suffix -mania (from mainesthai, meaning "to be mad"). People suffering from trichotillomania will routinely pluck hair from the scalp, eyebrows, eyelashes or other parts of the body, usually impulsively but sometimes with careful deliberation (such as by using tweezers). Some researchers believe that it may be a form of obsessive-compulsive disorder. The word for this condition first appeared in English around the dawn of the 20th century (it's generally thought to have been first coined in French by a French dermatologist).