Hi

I don't have dermatillomania, but have trichotillomania. Fidget toys are great. When I'm on the go or just can't have my hands visibly occupied by an item, I fidget with my rings on my fingers to keep my hands busy. Also hand lotion makes it tougher to pick/pull at things, plus it keeps your hands soft

Nah I don't think clipping a specific hang nail counts