Gray nails are clinically known as onychomycosis. Miconazole nitrate cream can be used for the adjunctive treatment of onychomycosis, if the use of this drug alone may not be effective, it is recommended that a combination of oral medication treatment. Onychomycosis is mainly an infectious disease caused by fungal infection of the nail plate, nail bed, and subnail tissue. Miconazole nitrate can treat onychomycosis, but using only topical application of miconazole nitrate may not be effective as the drug may not be able to penetrate well across the entire nail into the infected foci. It is recommended that a combination of medications, such as combined oral medications terbinafine or itraconazole, be guided after evaluation by a clinician. Meanwhile, when using miconazole nitrate, it is necessary to pay attention to the fact that if there are symptoms such as local pain or unbearable itching, fever, swelling, etc., it is recommended to stop using the drug immediately, and rinse with water, etc.. If you are pregnant or breastfeeding, it is recommended to use the drug with caution. Miconazole nitrate is recommended to be used under the supervision of a clinician; the appearance of gray nails (onychomycosis) is recommended to consult a doctor promptly.