One eyelid is swollen without pain or itching may be due to simple edema, lid gland cyst or mild allergy. 1. Drinking a lot of water before going to bed, staying up late for a long time, pregnant women and other special people will wake up in the morning when the eyelids will be edematous, usually both eyes, occasionally only one eye, not accompanied by pain and itching. There is no need for special treatment, pay attention to half an hour before going to bed, do not drink water, do not stay up late, after a period of time the swelling subsides. 2. Usually, the blockage of the lid glands will cause chronic granulomatous hyperplasia, and one eyelid will be swollen suddenly without pain, itching, congestion and fever. Generally, it can be treated conservatively with hot compresses and glucocorticoid ointment such as dexamethasone, or the cyst can be removed surgically. 3. When the eyelids are mildly allergic, there may be no redness, swelling and stinging, and the eyelids are only swollen. At this time, you can apply local dexamethasone and other ointments to reduce inflammation. Long-term eyelid swelling and even affect normal vision, it is recommended to go to the hospital in time, follow the doctor’s instructions for medication, so as not to delay the condition.