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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.
When you play sports, there is a chance of having your toe stepped on which can increase the chances of fungal spores getting under your toenail. In some cases, running a lot in brand new shoes that have not been worn in can cause a black toe nail fungus to appear.