Yep got the skin biting thing too and got a monster infection as a kid. Mom dragged me over to my father screaming "Look at this!" then seared it with a needle, screamed at me some more then locked me in my room as usual. Knuckles permanently scarred because I anxiously gnawed them to the point of scarring as a kid. I have always been very ashamed of my hands... I was even told they look old, by a stranger when I was in my 20's. But yeah... always chewing and picking my whole life. What really upsets me is the permanent damage like my scarred hands... that invite rude comments from other people. I mean it's anxiety that caused me to do it, I am anxious even being in public and then someone says something rude and I fell like s*** again and regret having left the house.