Gray Nails: One possible cause of blue-gray nail discoloration is using the drug minocycline. This broad-spectrum antibiotic has been found to turn nails a light blue-gray color. However, there are many other causes of nail discoloration as well, including fungal infection, chronic diseases and the use of various medications. Contact your doctor to get an accurate diagnosis.
Answered 2/20/2020
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Fungal infection: When toenails get discolored and become yellow or gray and there are no other associated symptoms then more than likely it is a fungal infection and this condition is called onychomycosis. It is treated with topical or PO anti fungal medication.
Answered 2/20/2020
5.4k views
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