The treatment of gray nails should be done in a hospital by a dermatologist. Because the nails are part of the skin appendages in dermatology, nail diseases belong to dermatology. Gray nails are usually caused by fungal infections that cause damage to the nails. The main clinical manifestation of nail damage is a grayish nail with thickened, hypertrophic and powdery nail free edge. In this case, it is usually necessary to go to the hospital for a microscopic examination after the dermatology department. If the examination confirms a fungal infection. Antifungal treatment is required.