What Your Fingernail Lines Say About Your Health

Black nails

Black or purple nails are common after an injury. The dark color is a sign that blood is pooling under the nail, and typically this is no reason to worry. The color should return back to normal on its own after a few weeks. If it doesn’t, you may need to have the blood drained by a doctor. If you didn’t have an injury, and your nail looks black, this could be a sign of melanoma.