I. How do I catch gray nails? Gray nails are a contagious skin disease caused by a fungal infection. The scientific name is onychomycosis. The common types of fungi that are infectious are Trichophyton rubrum, Trichophyton spp. etc. Gray nails are generally susceptible to fungal infections in the following cases. 1, perinail disease, such as nail fungus, perinail microcirculation, psoriasis nail, eczema nail, nail injury, etc., the fungus is easy to pass through the broken skin and nail plate, resulting in gray nails. 2, the human body resistance to decline, that is, low immunity to cause fungal infection, resulting in gray nails, such as the elderly and easy to cold people. 3, Foot fungal disease, such as long-term tinea pedis, easily infects the fingernails causing nail fungus. 4, Other chronic diseases, such as malignant tumors, diabetes, high blood lipids, high blood viscosity and so on. 5, Long-term use of antibiotics can also cause dysbiosis leading to gray nails. The process of infection is usually the fungus first invades the perinail as well as the nail plate and nail bed, the fungus further multiplies and grows and slowly expands to further infect the nearby toenails. The actual clinical treatment of grey nails. The actual fact is that you can find a lot of people who are not able to get a good deal on this. It is usually itraconazole, terbinafine, fluconazole and so on are used in accordance with the course of treatment to inhibit or kill the fungus and cure the gray nail. However, patients with liver function problems should not use this method. 2. Topical antifungal medication is applied to treat the fungus, usually by removing the diseased nail with a special tool and applying a nail-softening cream. Finally, antifungal medication is applied. This method of treatment takes longer and patients need to adhere to the treatment. Oral medications can be used to treat both inside and outside at the same time for better results. The advantage is that the side effects are small. 3.Laser treatment, Q1064 laser or IPL treatment can make the instant high temperature of the lesion, kill the fungus, to achieve rapid treatment purposes. 4, surgical removal of the diseased nail, cleaning the lesion nail bed, with the application of drugs, can also achieve the purpose of treatment. The above methods need to be chosen according to the patient’s situation, with the use of treatment plans, according to the standard use of drugs in accordance with the course of treatment to be able to have good results.