Tricho- What???

Trichotillomania (pronounced: trik-oh-till-oh-MAY-nee-uh) is an impulse control disorder (ICD) that involves strong urges to pull out one's own hair. An impulse control disorder is a type of psychological condition.
Doctors used to believe trichotillomania was rare. But that thinking is now changing as experts gain a better understanding of the condition and more people come forward for help. Trichotillomania affects more girls than guys. Most people who have it develop it during adolescence. But trichotillomania can start in kids as young as 1 year old.

People with trichotillomania pull hair out at the root from places like the scalp, eyebrows, eyelashes, or pubic area. Some people pull large handfuls of hair, which can leave bald patches on the scalp or eyebrows. Other people pull out their hair one strand at a time. Some inspect the strand after pulling it out or play with the hair after it's been pulled. About half of people with the condition put the hair in their mouths after pulling it. Some people are very aware of their pulling; others seem to do it without really noticing what they're doing.

Reference kidshealth.org