Not sure whether you have Dermatillomania or not?
Online Test for Skin Picking
Find out the severity of your symptoms with this free online test
Ask the OCD center of Los Angeles. Their new free service promises to answer the sometimes subtle question of "do I have Dermatillomania?"
All you have to do is answer some simple questions online, and they promise to give you an answer by email. Of course this is not a substitute to thorough evaluation by a professional.
EDIT: you can also try SkinPick's dermatillomania test