Bruised nail

A blue, dark red or black nail often develops when blood becomes trapped underneath after a blow or prolonged pressure. This is called a subungual haematoma. A small bruise usually grows out on its own, but severe pain, a large wound or a dark spot without a clear injury needs assessment.

• Briefly cool the finger or toe with a cold compress wrapped in a cloth, rest it and keep the hand or foot raised.
• Never drill, burn, pierce or cut the nail open yourself. This may cause infection, a burn or further nail damage.
• For a recent, very painful collection of blood, a doctor may sometimes safely relieve the pressure. This is most useful in the first one to two days.
• A loose nail may fall off later. A fingernail usually grows back within a few months; a toenail often takes much longer.
• Have a new brown or black stripe without injury checked, especially if it widens or the skin beside the nail changes colour.