Itchy and painful eyelids may be related to mosquito bites, allergic conjunctivitis, blepharitis and so on. 1. Mosquito bites: It is due to the skin of the eyelid being bitten by mosquitoes, etc., which causes the mouthparts of mosquitoes to release toxins, causing itchy and painful sensations in the eyelids. 2. Allergic conjunctivitis: due to eye contact with allergens, such as pollen and other substances, causing an allergic reaction in the eyes, which can cause itching, redness and swelling in many parts of the eyelids and other symptoms. 3. Blepharitis: may be due to poor quality cosmetics, visual fatigue, etc., eyelid margin congestion, accompanied by secretions, patients feel itchy, tingling sensation. Eyelid itching and pain for a variety of reasons, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.