Gray nails generally refers to onychomycosis, erythromycin ointment can not treat onychomycosis. Erythromycin ointment is a macrolide antibiotic, antibacterial to most gram-positive bacteria, some gram-negative bacteria and other bacteria, chlamydia, etc., use should pay attention to avoid contact with mucous membranes such as the eyes, mouth and nose, and avoid combining with chloramphenicol and lincomycin and other drugs. And nail fungus is usually due to fungal infection, so erythromycin ointment can not treat nail fungus. Ringworm of the nails is usually treated with antifungal medications such as amorolfine hydrochloride applicator and terbinafine hydrochloride gel. Adverse reactions such as itching and flaking may occur when using Amorolfine Hydrochloride Application, and it is forbidden for women who are allergic to the ingredients of the drug, pregnant women and women who are preparing for pregnancy. Terbinafine Hydrochloride Gel may cause rashes, itching and other uncomfortable symptoms, allergic to the ingredients of the drug is prohibited, pregnant women and breastfeeding women should not be used. Nail fungus is stubborn and difficult to cure, treatment time is long, and easy to recur, so you need to follow the doctor’s instructions, adhere to long-term treatment. Usually do a good job of personal hygiene, avoid sharing slippers, towels and other items with others.