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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.
Your feet also swell during a walk or run and get compressed by your socks and shoes. That pressure and impact can damage your toenail beds, or create a blister under the toenail itself. When this happens, the extra blood and fluid cause your toenail to separate from the toenail bed. The blood colors the toenail black. Your toenail will probably continue to change colors during this process.