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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.
Runners who are training for a marathon or do a lot of downhill running are the most likely candidates for black toenails because their toes are constantly rubbing up against the front of their shoes. You're also more likely to get black toenails if you run in warmer weather because your feet swell more when it's hot.