SandBar Callus Remover File for Hands - Durable Aluminum Tool for Callus Care and Dead Skin Removal - Includes Nourishing Salve - Ideal for Athletes, Climbers, and Gym Enthusiasts

File them off; otherwise they we’ll eventually rip off and bleed everywhere. Something like this might be helpful. And use chalk.

Using something like this helps keep the skin from bunching or peeling which is what usually causes tears. Applying a hand salve can also help maintain that area of skin around the thumb.