This has all the grizzly features of trench foot, or jungle rot, that WWI vets suffered from prolonged exposure to unsanitary conditions and constant wet/dry feet. Lake Powell Foot is the result of brutal exposure to mid-summer Utah sunshine, zero humidity, barefoot 10 mile slot canyon death marches, and days of drunken horse shoes on the hot Lake Powell sand.
Not necessarily a bad thing to have, considering your surroundings.
Justin has some serious Lake Powell Foot after that 8 mile hike to Window Arch. It's all dry and cracked like an over cooked baked potato.