Gray nails are caused by fungal infection, treatment of gray nails can use cyclopirox ointment, amorolfine hydrochloride cream, miconazole nitrate cream and so on. There is no such thing as the best ointment, you should choose the drug according to your condition, and there is individual variability in the specific recovery situation. 1. Cyclopyrrolidine ointment: the main ingredient is cyclopyrrolidine, mainly by changing the integrity of the fungal cell membrane leading to the death of fungal cells, the drug penetration is better, can penetrate to the deck, so as to play a role in killing the fungus. 2. Amorphophallus hydrochloride cream: the main active ingredient is amorphophallus hydrochloride, by blocking the biosynthesis of ergosterol in the cell membrane of the fungus to achieve sterilization, and has a highly effective inhibitory effect on dermatophytes. 3. Miconazole nitrate: mainly composed of miconazole nitrate, by destroying the synthesis of fungal cell membranes to bactericidal inhibition. It is recommended that specific drugs be used under the guidance of a doctor to avoid adverse reactions.