How to Stop Skin Picking Habits?

I Realize that I had this problem when I was a child. I used to bite my nails as a kid and then started picking at my cuticles and stop for a while. My mother always asks why I am doing that and that It can get infected. That never stopped me from continuing to pick at my skin. As years go by I noticed I was doing it so often that my skin is lighter on my fingers and once it start Healing on the weekends I start right back up. Does anyone have techniques to prevent you from picking or biting your skin.