Scratching Anxiety

When I get really anxious/stressed about something I will pick sores on my body to the point of bleeding. Currently I do this on both my thumbs and the skin is now red raw. During summer when wearing t-shirts I will scratch the top of my back and shoulders. I now have scars from old sores. I don't wear t-shirts showing my shoulders anymore. Is there anyone else who suffers from this? What can I do to stop it? I have anxiety and take anti-depressants.

I've gained some understanding on the causative factors that incite my girlfriend to do this to her face at times, so i could perhaps make use of this insight if there would appear to be some similarities in between the nature of both of your urges.