Is it normal that i'm addicted to scratching my thumb?
I have this strange addiction that i scratch the sides of my thumbs. First, I started with my right thumb about five years ago. Then I started with my left thumb a year ago. I scratch them with sharp objects but mostly with zippers.It may sound strange but I move apart two of the teeth of the zipper and scratch my thumbs between them... I do that when I'm bored or I study or read something. I just can't concentrate without it! What can I do to stop it because my skin is really thick? I'm a girl and I don't like seeing my hands like this!!!