I'm sorry I'm not able to be of help with regard to this. However I noticed no one had yet replied to your post. So I thought I would. Here are links to 2 articles, from PC's archives, written by a person who has battled dermatillomania. I should mention there are pictures that are somewhat graphic & the author does offer a warning at the beginning of the articles. Hopefully though, if you're up to reading the articles, some of what she has to say can be of help or at least interest:

Picking Myself Apart (Pt. 1)

Picking Myself Apart (Pt. 2)