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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.
Blunt or repeated trauma to a toenail can also lead to an infection. Common examples of trauma are a crushing-type injury to a toe or athletic activity that causes rubbing of the nail against the shoe. In these cases, an infection may develop along with a loose or black toenail that occurred from the trauma.