|Fingers after a proud effort on the Incredible Hulk in the Eastern Sierras|
There are climbing areas where the rock and style of holds conspire to separate your finger from your nail. Sierra granite and Red Rock sandstone come to mind. It's like the old torture with the bamboo splinters under your nail.
The good news is that you can treat these wounds with Super Glue. If you're really smart, you'll foresee the insidious grit and apply the glue under your nail before you climb. Unstoppable.