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When Toes Turn Dark. Nails change colors for multiple reasons. The most common culprit for a black toenail is blood under the hard tissue. Damage to the end of the toe causes blood to leak through the nail bed and stain the keratin a dark color. This is also known as a subungual hematoma, or a bruise under the nail.
The black nail is caused by the bumping of the toe forward, slinging a bit more blood under the nail with every step. Running on icy, snowy paths require greater traction and a slower pace thereby causing more bumping of the toe into the front of the shoe. Keep your toenails clipped so as to keep more distance.