Redness and swelling under the patient’s eyes may be caused by eye infections, eye allergies, and eye trauma. After patients are bitten by mosquitoes or contact with allergens such as dust and pollen, allergic patients may have an allergic reaction, and patients may experience discomfort such as red, swollen and itchy eyes. Patients with eye infections such as bacterial conjunctivitis, keratitis, blepharitis, etc., under the stimulation of inflammation, patients may experience discomfort such as redness, swelling and pain of the eyelids. In addition, if the eye is accidentally injured during strenuous exercise, the patient’s eye soft tissue contusion, the patient may appear eyelid redness and swelling and other discomfort symptoms. It is recommended that patients with significant redness and swelling of the eyelids seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.