Trich is being researched and some find it to be a gene link (an overactive gene in the self grooming area). However, that is for the more semi-conscious trich people. It is what links them up to the OCD symptoms as they feel compeled to do so without thinking.
There are also trich people that pull for the euphoria pain release from the hair tugged out. These are the ones that the action of trich is, in fact, self harm
However, both trich people can be helped with the same methods and drugs- also the same methods and drugs as other self harm people. Most commonly, SSRIs.
Just some info~! That is why I include all Trich people to this.
Thanks for the comment!