I have had this issue since I was about 13 years old. I also grew up in severely abusive situations and have very mild PTSD. I notice that there also seems to be a correlation between this and smoking with me. I know it's a direct result of stress. I seem to obsess over things and do this behavior when I'm deep in thought. I've tried to stop and will stop for a little while and then I end up right back to it. My mother also did this as well, to the extreme. What has others done to stop this behavior. I've created scarring on my face, it's terrible. I can't seem to stop. Does anyone one else here deal with PTSD?