Erythromycin used in ophthalmology usually refers to erythromycin eye ointment. The swelling of the baby’s eyes by mosquito bites can generally subside on its own, there is no great need to apply erythromycin ophthalmic ointment. The baby’s eyes are swollen by mosquito bites, usually after a few days will subside on their own, if the itching symptoms are more obvious can be a cold compress to stop the itching. Erythromycin ophthalmic ointment is mainly used for trachoma, conjunctivitis and external eye infections. Adverse reactions mainly include occasional eye pain, persistent redness or irritation and other allergic reactions. Mosquito bites can be used without erythromycin eye ointment. Babies with swollen eyes from mosquito bites should be careful not to let the baby rub the eyes, or the swelling may be aggravated. If the swelling is obvious after the occurrence of mosquito bites, it is recommended to take the baby to the hospital in time to deal with, do not blindly use their own medicine.