Itchy eyelids may be caused by allergy, blepharitis, conjunctivitis and other reasons. 1. Allergy: If the eye area comes into contact with allergens such as pollen, animal hair, dust and other allergens, an allergic reaction may occur due to the allergen stimulation, resulting in itchy eyelids. 2. Blepharitis: blepharitis is an inflammation of the eyelid area due to bacterial infection, which is a common skin disease of the eye surface and may cause itching of the eyelids, and may be accompanied by pain, redness and swelling. 3. Conjunctivitis: After the eyes suffer from conjunctivitis, due to local inflammation stimulation, it is easy to appear eyelid itching, and may be accompanied by eye redness and other phenomena. Patients with itchy eyelids should go to the ophthalmology department of the regular hospital in time to clarify the cause of the disease and give targeted treatment measures under the guidance of professional doctors.