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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 Toenail Symptoms. The big toe is most often affected. Bruised, broken blood vessels cause the black, blue, and deep purple colors under the nail. Particularly with a blood blister, the fluid buildup can irritate the toe itself causing it to redden, swell, and throb. If the black toenail is the result of a blood blister the painful symptoms should decrease within 24 hours.