What does it mean if my nails have a light blue-gray discoloration?

Dr. Ellen Marmur, MD
Nails' color can be just as informative as their shape. It indicates either a collagen vascular disease or some kind of drug toxicity or hypersensitivity. For example, the antibiotic minocycline could cause a reaction.

Simple Skin Beauty: Every Woman's Guide to a Lifetime of Healthy, Gorgeous Skin 

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Why is painting your nails an unhealthy idea?
Nail polish is likely the most toxic chemical there is.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.