Gray nails are caused by a fungal infection of the nails and this condition can be cured, mainly through antifungal treatment. There are a number of specific treatments. In this case, if the nail is a single gray nail, you can consider surgical nail extraction, but of course there are certain risks associated with surgical treatment, such as it can cause significant painful symptoms or lead to further infection and may be prone to recurrence. For multiple gray nails, you should consider topical application combined with oral medication, usually topical application of amorolfine hydrochloride and oral itraconazole or terbinafine. This situation can also choose the method of sealing treatment, usually also pay attention to cleanliness and hygiene, strengthen nutrition, adhere to exercise, enhance resistance.