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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.
Causes of Black Toe. The most common cause of black toe is repeated trauma from the toe banging against the end of the shoe. Since the big toe is usually the longest toe, the banging produces bleeding and bruising of the nail, causing it to become discolored (often blue and then black).