I found another site that gives the following information.
Cognitive-behavior therapy has been studied as a means of treating Dermatillomania and related disorders. Therapy may involve several different techniques, outlined below:
Habit Reversal Training (HRT) is a four-step process that teaches the person with Dermatillomania how to relax, how to breathe and feel centered, and to perform muscle response exercises. HRT includes self-monitoring and stimulus control (described below), and social support.
Self-Monitoring is making the person suffering Dermatillomania more aware of their behaviors. Dermatillomania behavior can often be unconscious; awareness can be improved by starting a log of picking behaviors. The very act of recording the behavior can also interrupt the process and reduce the picking.
Stimulus Control (SC) is a behavioral treatment that helps Dermatillomania sufferers identify and eliminate, avoid, or change the environmental factors, moods, or circumstances that trigger picking. The goal is to consciously control these triggers and create new connections between the urges and non-destructive behaviors.
For example, if Dermatillomania happens alone, the person is encouraged to spend more time with others. If the picking occurs in front of a mirror, the person may be asked to cover the mirrors in their home.
Competing Response is a technique designed to give the person an alternative to picking. This can include fidget toys, knitting, beading, or other activities to keep the hands busy.
Online Dermatillomania Support Groups. Some of these support groups use the 12-step Alcoholics Anonymous program to help people to “quit” picking. Links to some of these sites will be provided below.
Hotlines:
National Alliance on Mental Illness (NAMI) 1–800-950-NAMI (6264)