Gray nails can usually induce nail fungus, mainly due to fungal infection causing gray nails, which leads to nail thickening squeezing the surrounding tissues, thus causing nail fungus. When gray nails are complicated by nail fungus, the following treatments are common: 1. Non-purulent phase: topical antiseptic and antiseptic agents that are antiseptic and anti-inflammatory, such as ichthyolite ointment, or antibiotic ointments, such as fusidic acid cream and mupirocin cream, are usually used. It is also necessary to cut the nails that have grown into the nail bed, and local exposure to helium-neon laser, which also helps to eliminate inflammation and tissue repair; 2. Suppurative stage: If there is local pain and swelling, abscess formation, surgical incision and drainage can be performed. When the damage is deep, broad-spectrum antibiotics can be used for systemic treatment. In case of obvious loosening of the diseased nail or serious accumulation of pus under the nail, removal of the diseased nail can be considered. As nail extraction is an invasive operation, it can cause new trauma and the diseased nail itself is associated with fungal infection, which can lead to aggravation of symptoms and difficulty in recovery. In addition, after the symptoms of nail infection have subsided, patients need to actively treat their gray nails to prevent the recurrence of nail infection. For example, topical application of bifenazole cream, miconazole cream, clotrimazole cream, etc. If necessary, oral antifungal drugs such as terbinafine, itraconazole, etc. are used for treatment.