Trichotillomania is an obsessive-compulsive-related disorder that has as the main symptom.

The main symptom is hair-pulling, usually of the scalp, eyelashes, and eyebrows.

I myself have trichotillomania so I personally know what it´s like.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

yes it is weird but true