Erythromycin ointment will be itchy after smearing the glans, which is mainly considered to be related to improper medication, drug allergy and other factors. 1. Improper medication: the causes of glans are complex, such as bacterial infection, fungal infection, trichomonas infection, external injury, etc., can trigger glans; erythromycin ointment has a certain degree of efficacy for most of the bacterial infections caused by glans; however, for the glans caused by other causes of glans, there is not a great deal of efficacy, which will lead to the symptoms of the glans itchy. 2. Allergic reaction: after applying erythromycin ointment, some patients may have adverse reactions such as local itching, burning and tingling, which should be stopped in time and treated by a doctor. 3. Other factors: such as poor material of underwear, lack of hygiene or external damage to the penis can also lead to glans itching. After the use of medication, the symptoms of glans itching. You must stop taking the medication in time and seek medical examination to confirm the cause of the disease; after clarifying the cause of the disease, it will be disposed of in a targeted manner.