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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.
Most black toenails follow a fairly consistent uneventful course. They turn black and fall or peal off after several months with no pain or complications. If, however, there is pain, swelling, or drainage associated with a black toenail a trip to the podiatrist is recommended.