The treatment protocol for the ACT for skin picking study is exactly the same as the one for the OCD study by the same authors. All you need to do is change the word "obsession" to "urge to pick" and it will fit nicely.
Twohig, M. P., Hayes, S. C., & Masuda, A. (2006). A preliminary investigation of ACT for chronic skin picking. Behaviour Research and Therapy, 44, 1513-1522.