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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.
There are several possible causes of brown toenails. Repetitive trauma (like running in a shoe that is too small, for example) can make the area under the nail bleed, causing a subungual hematoma. Also, certain myotic infections (fungal infections) can cause the underside of the nail to gather fungal debris of a brown or clack color. Women of color may get dark stripes or dark areas in their nails that are completely normal.