Redness of the upper eyelid may be related to blepharitis, eyelid allergy, conjunctivitis, and wheals. 1. Blepharitis. Most of them are caused by staphylococcal infection. If the affected area is in the upper eyelid, it will cause redness and swelling of the upper eyelid. 2. Eyelid allergy. Caused by contact with allergens. If the contact is on the upper eyelid, there are often symptoms such as redness, swelling and rash on the upper eyelid. 3. Conjunctivitis. It can be caused by pneumococcal and staphylococcal infections, which can also cause redness, itching, and increased secretion of the upper eyelid. 4. Granuloma. If you don’t pay attention to eye hygiene, often rub your eyes, touch your eyes and other bacterial infections, if the affected area is in the upper eyelid, it will cause redness, heat, swelling and pain. If the symptom of redness of the upper eyelid is not relieved, you should go to the hospital to clarify the cause of the disease and treat or deal with it under the doctor’s instruction.