Very itchy eyelids may be caused by allergy, blepharitis, eczema and other reasons. 1. Allergy: If the patient’s eye skin comes into contact with allergens such as skin care products, pollen, makeup, etc., resulting in an allergic reaction on the eyelids and an itchy eyelid. 2. Blepharitis: If the edge of the eyelid or the inner and outer corners of the eye, close to the root of the eyelashes are inflamed, resulting in blepharitis, it may be manifested as an obvious itchy sensation on the eyelid, accompanied by a burning sensation and scaly eyelid discharge. 3. Eczema: If the skin around the eyes has been soaked with tears or sweat for a long time, triggering a chronic inflammatory reaction and leading to the formation of eczema, it may be accompanied by very itchy eyelids. Patients with itchy eyelids should go to a regular hospital in time to identify the cause of the disease and take targeted treatment under the guidance of a professional doctor.