Redness and swelling of the lower eyelids of infants may be caused by prolonged crying, mosquito bites, and localized inflammation of the eyes. 1. prolonged crying: if the child cries for a long time and rubs his eyes with his hands, the child’s eyes may appear red and swollen, usually after stopping crying can be relieved, and do not need special treatment. 2. Mosquito bites: mosquito bites can also cause swelling of the lower eyelids of children, accompanied by obvious eye itching and other symptoms of discomfort, if the child scratches the lower eyelids of uneven swelling. 3. Localized inflammation of the eye: If the patient has localized inflammation of the eye, such as conjunctivitis, keratitis, blepharitis, etc., the child may have symptoms such as eyelid swelling, accompanied by photophobia, tearing and other discomforts. It is recommended that children with significant redness and swelling of the lower eyelids be seen promptly for evaluation of their condition and treatment as prescribed by their physician.