Gerbil Medical Quirk #812/813: dermatophagia, and its annoying sibling dermatillomania. Meaning it’s not uncommon for my fingers to be either 1.) covered in bandages, or 2.) like this [WARNING for icky].
If anybody else deals with this, I can let you know some good ways to wrap your fingers against picking using store-brand knuckle bandages… though trying to stop this is so hard, augh! No matter how well I do, all it takes is one phantom gnawing going on for long enough, and I’m back to square one.