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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.
The result is an unsightly bruise or black toenail. Warmer weather also increases your chances of developing a black toenail. Warm weather causes the blood vessels to dilate allowing more blood to sling forward in the toes during running. Symptoms. Generally speaking, black toenails are not painful. The tiny ruptured blood vessels only cause the unsightly appearance of the nail. However, if enough fluid builds up under the toenail the pressure can cause pain, swelling and throbbing.