The upper eyelid of one eye suddenly swollen, need to identify the cause, such as allergies or infections, should be given for the cause of drug treatment. Allergy: such as cosmetics, willow floss and other allergies, you need to get rid of allergens, in the local application of hormone eye ointment treatment, to block the allergic reaction, so as to eliminate the edema, commonly used tobramycin dexamethasone eye ointment and so on. Infection factors: such as blepharitis, conjunctivitis, etc., mostly bacterial infections need to be treated through the topical application of antibiotic eye ointment, such as levofloxacin eye ointment, etc.; if viral infections, you can use acyclovir eye drops, etc.; if fungal infections, you can use miconazole eye drops. One eye upper eyelid suddenly swollen for a variety of reasons, should be under the guidance of the doctor to clarify the cause, and give targeted treatment.