My dad lost both his big toe nails after hiking Mt. Rainier because he had worked a blister under each one on the way down and didn't do anything about it.

Had to drill a friends big toe nail for the same reason on a hike once. One word of warning, when you go to poke the hole, make sure you are wearing eye protection and/or aren't in the line of fire of the liquid geyser,

Blechhhh!!!!