There are many reasons for itchy eye margins, which may be caused by blepharitis, blepharopharyngitis, eyelid skin disease and so on. 1. Blepharitis: Blepharitis is generally associated with physical and chemical irritation, poor hygiene habits, bacterial infection, refractive error, tearing and decreased body resistance, including scaly blepharitis, ulcerative blepharitis, canthus blepharitis, etc., and the patient may have itchy eyes and other uncomfortable symptoms. 2. Blepharophimosis: patients with blepharitis, blepharophimosis cysts, blepharophimosis obstruction, etc., because of inflammatory stimulation, swelling friction, patients may also have itchy eyes and other uncomfortable symptoms. 3. Eyelid skin diseases: Eyelid eczema, eyelid herpes zoster, herpes simplex virus blepharitis and other eyelid skin diseases, patients can also appear eyelid itching and other discomfort symptoms. It is recommended that patients with itchy eyelids consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.