Your toenails and fingernails protect the tissues of your toes and fingers. They are made up of layers of a hardened protein called keratin, which is also in your hair and skin. Your nails' health can be a clue to your overall health. Healthy nails are usually smooth and consistent in color. Specific types of nail discoloration and changes in growth rate can signal various lung, heart, kidney and liver diseases, as well as diabetes and anemia. Nail problems that sometimes require treatment include bacterial and fungal infections, ingrown nails, tumors and warts.
Nail problems should be evaluated and treated by your podiatrist, who can diagnose the ailment, and then prescribe medication or another appropriate treatment.
Vicks vaporub WILL help clear that up. Applied twice daily, you will see normal toenail color on new nail growth in a few weeks. Be patient, toenails grow slowly. I have seen this work for a friend and my husband. I first heard of this from an "Ask The Doctor" column.