Ken mentioned black toe syndrome from toes sliding forward in too loosely tied and/or too short boots. Typically the longest (second) toe is affected but it can be all of them (!), The pounding inside the boot bruises the toe (blackens) and it later falls off. Also sometimes called tennis toe. Definitely a downhill runner/hiker/backpacker problem, too. Like hot spots and blisters, if you think it is happening, it is ( or already has). Stop and fix the problem.
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