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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.
However, the presence of foot pulses in a person with blue toe nails does not rule out a vascular cause of the syndrome. Pain: The blue-ish discoloration is often accompanied by excruciating pain. This pain may be felt only in the foot, or even in parts above the foot. Skin discoloration: Blue toe syndrome may also present with discoloration of the skin, often in a lace-like pattern. Swelling: There may be swelling of the toes and feet. This is often mild, but can be severe. What Causes Blue Toe Syndrome?