Gray nail is a common fungal disease caused by a fungal infection of the nail plate and the underlying nail tissue. It is true that Chinese herbal medicine can be applied in the clinic to complement the treatment, but Chinese herbal medicine is mainly applied as topical medications, such as the common clinical use of Serpentine, Fangfeng and Huanglian, which have the ability to clear heat and detoxify as well as dispel wind, and can be used as topical antifungal wash. However, in fact, in clinical practice, Chinese herbal medicine is not applied as the main method, but patients use Chinese herbal medicine as a complementary treatment when applying other antifungal drugs. Therefore, it is not recommended that patients simply apply the therapy of Chinese herbal medicine to treat gray nails, because if the gray nails are not cured in time, the fungal infection will become very troublesome for the patient if it is prolonged and difficult to cure.