I believe picking is cause by repressed anxiety. I've noticed when I recall painful past events or encounters, I end up in front of my bathroom mirror nine times out of ten. From what I've read from the many stories posted on here, picking is our form of coping mechanism. Instead of dealing with the problem at hand, we shove it aside and choose to ignore it. If you've been addicted to picking for over a year, that just shows to prove it. It's so hard to quit, because that means dealing with whatever problems we're hiding from in real life; whether they're psychological, physical, emotional, etc. I've noticed right after I pick there's a brief moment of high and joy. Later I feel bad about it, but I choose to ignore it and forget about it. I believe the first step to quitting is learning to face your fears and problems.