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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.
We would be happy to re-visit this issue so all can benefit! Black toenails (sometimes called runner's toes) are a very common complaint that I get at this time of year, and are easy to prevent. Simply put, black toenails are caused by improperly fitted running shoes. All running shoes should have one thumbnail's length from the tip of your longest toe (and in some that means the second toe) to the end of the shoe.