Gray nails and onychomycosis are two different diseases. Gray nails can be treated with medication or nail removal. Folliculitis can be treated with medication, physical therapy or surgery. 1. Gray nails: Gray nails are caused by fungal infection, also known as onychomycosis. Patients can use topical antifungal ointment, such as amorolfine or terbinafine tincture, or take oral antifungal drugs, such as itraconazole. For those who can’t get rid of their nails with medication, nail extraction can be used to improve the condition. 2. Inguinitis: Inguinitis is usually caused by the infection of the tissues around the nail, which is commonly caused by Staphylococcus aureus infection. Patients can use topical antibiotics, such as fusidic acid cream, mupirocin cream, etc., oral amoxicillin capsules. Physical modalities such as infrared rays and semiconductor lasers can also be used for improvement. If there is pus around the nail, surgical incision is recommended to drain the pus. For the existence of gray nails or inguinitis patients, it is recommended to go to the regular hospital in time for examination and standardized treatment under the guidance of professional doctors.