Understanding Black-and-Blue Nails

How are black-and-blue nails diagnosed?

Your health care provider will talk with you about your symptoms and physical activities. They may press the area at the end of the toe to determine the extent of pain. Your toe and foot will be examined for any signs of infection. If a fracture or a bone spur is suspected, X-rays may be needed. If small black spots are present under the nail, more tests may be done to rule out other problems.

Treatment for black-and-blue nails

If your pain is severe, your health care provider may remove the nail. Or they may drill a hole in the nail to let the fluid drain from underneath. This relieves the pressure. A local anesthetic (numbing medicine) may be used first. Pain may also be relieved with prescription medicines. Soaking or icing the area may also help. If the pain is not severe, you may not need treatment. The nail can be thinned or left alone to fall off on its own. A new nail should grow to replace it.

Preventing black-and-blue nails

You can prevent many nail problems by wearing the right shoes and trimming your nails properly. To help prevent infection, keep your feet clean and dry. If you have diabetes, talk with your health care provider before doing any foot self-care.

• The right shoes. Get your feet measured (your size may change as you age). Wear shoes that are supportive and roomy enough for your toes to wiggle. Look for shoes made of natural materials such as leather, which let your feet breathe.

• Proper trimming. To prevent problems, trim your toenails straight across without cutting down into the corners. If you can’t trim your own nails, ask a provider to do so for you.