Itchy upper eyelids are usually associated with contact dermatitis, blepharitis, and eyelid eczema. 1. Contact dermatitis: it is related to contact with allergens, such as pollen, mites, animal fur, etc. Repeated contact may lead to skin allergy, which is easy to cause itching, redness, burning and stinging. 2. Blepharitis: It is an inflammation that occurs at the margin of the eyelid, usually related to factors such as infection with Staphylococcus aureus, or due to dysfunction of the blepharoplast. Patients mainly have dry eyes, itchy eyelids, red eyes and other symptoms. 3. Eyelid eczema: it is an allergic skin disease, usually occurring in the eyelid area, manifested as itchy skin and red rash. Itchy upper eyelids may also be caused by other reasons, it is recommended to observe for a period of time, if the symptoms persist for a long time, you should consult a doctor.