The causes of swelling on the eyes are as follows: 1. Allergic reactions: There may be an allergic reaction to cosmetics, pollen, or other allergens, manifested as swelling, edema, and itching of the upper eyelid of the eye, which can be treated with local ice packs, or local anti-allergy eye drops or eye ointment, which can be applied in a timely manner. 2. Macroglossia: Also known as acute lid gland infection, this is an acute inflammation of the lid gland caused by bacterial infection. This is an acute inflammation of the lid gland caused by bacterial infection, which manifests as swelling of the upper eyelid, local pain, and increased skin temperature. It is usually treated with anti-inflammatory drops or ointment, and is treated by incision and drainage when pus is present. 3. Systemic diseases: such as hypothyroidism, severe anemia, total heart failure, renal failure, nephrotic syndrome, etc. Systemic diseases can also cause swollen eyes, and a systemic examination is recommended.