Swelling of one eye and half of the face may be caused by poor rest, but can also be seen in facial allergies, cellulitis and other systemic diseases. 1. Poor rest: when staying up late, overwork or long-term emotional stress, eyelid swelling and redness of the face can occur. At this time, you should pay attention to rest, rationalize the working time, relax and go to sleep early. 2. Facial allergy: Large-scale facial allergy can also lead to redness and swelling of the eyes and face. You can use topical anti-allergy drugs, such as budesonide ointment, etc. You can also take oral anti-allergy drugs. Oral anti-allergy drugs, such as loratadine, can also be taken. If necessary, you can go to the hospital to find allergens, and try to avoid contact with them. 3. Cellulitis: Cellulitis of the face and eyes can cause swelling, accompanied by pain and other acute infections. Antibiotic eye drops, such as levofloxacin eye drops, and systemic antibiotics, such as oral cefuroxime, amoxicillin, etc. can be used. 4. Other systemic diseases: many systemic diseases can lead to eyelid and face swelling, such as kidney disease, hypertension, heart failure, hypothyroidism, etc., need to be treated for these primary diseases. The medication should be administered under the guidance of a physician, and should not be used blindly. If there is any obvious discomfort or aggravation of the symptoms, the patient should go to a regular hospital in time to receive consultation and treatment.