Eyelid redness and swelling, usually related to inflammatory stimulation, allergic reaction, mosquito bites and other reasons. 1. Inflammatory stimulation: the eyelids have bacterial, viral, mycoplasma and other infections, such as contact blepharodermatitis, scaly blepharitis, blepharitis, etc., the inflammation stimulates the skin on the surface of the eyes, resulting in vascular dilation and congestion, and the permeation of tissue fluids makes the eyelids red and swollen. 2. Allergic reaction: the skin on the surface of the eyes comes into contact with allergic substances, such as pollen particles, knitted wool, etc., resulting in an allergic reaction, which is manifested as redness and swelling of the eyelids. 3. Mosquito bites: due to the loose skin tissue in the eyelid area, mosquito bites manifest as eyelid redness and swelling. Eyelid redness and swelling, it is recommended that patients go to the regular hospital in a timely manner, identify the cause of the disease, and then actively treat.