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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.
Black and blue: A black and blue toenail is usually due to trauma to the nail usually when running in shoe gear. If the nail is completely black and blue you may need to have the blood that has developed under the nail drained if this is causing you significant pain. ...