Erythromycin ointment should not be used because mydriasis is a localized disease of the eye. Erythromycin ointment is a dermatological drug, and the skin and mucous membranes around the eyes are relatively tender, so if erythromycin ointment is used, it may cause local burns. The correct case should be to choose erythromycin eye ointment, which are two different drugs, the difference being that the concentration of the drug is different. For the treatment of mydriasis, topical medication is still the mainstay. You can use topical antibiotics, such as tobramycin eye drops and erythromycin eye ointment. In addition, local hot compresses are also very helpful for the recovery of the disease, which can be applied effectively 2-3 times a day for about 10 minutes each time to promote blood circulation around the eyes and facilitate the recovery of the disease. Therefore, if the eye exists wheals need to buy drugs, must go to the doctor’s guidance, if you buy the wrong, such as the use of erythromycin ointment, not only can not play a role in the treatment, but also may bring harm.