www.Stoppicking.com . A recent article highlights the outcome data and are quite promising. See below link to the article.
Suzanne Mouton-Odum, Ph.D.
Flessner, C.A., Mouton-Odum, S., Stocker, A. J., & Kuethen, N. J. (2008).
StopPicking.com: Internet-based treatment for self-injurious skin picking.
Dermatology Online Journal, 13. Retrieved from
http://dermatology.cdlib.org/134/original/picking/flessner.html
the Trichotillomania Learning Center ( www.trich.org ) to be a great resource for both clients and clinicians regarding both hair pulling and skin picking.