Hair pulling is very much NOT a choice, and it is usually not a stress response gone too far.
Hair pulling is not a phase which people usually grow out of and recovery requires guidance, tools, treatment and support.
With early appropriate treatment, dedication and hard work, recovery is possible. The sooner you get help, the greater the chance of a full recovery.
If you have concerns that you or someone close to you has Trichotillomania, it is advisable to take the issue seriously, and to seek support.
See a dermatologist if you believe you have a skin complaint. If the urge to skin pick is experienced as itching, try to avoid eating yeast and carbohydrates for a week or so, to see if there is a marked difference.