Upper eyelid red molting may be caused by skin allergies, blepharitis and other reasons, need to analyze the specific causes. 1. Skin allergy: when the skin of the upper eyelid of patients with allergies comes into contact with allergens such as cosmetics, skin care products, etc., causing an inflammatory reaction of the skin, if the concentration of allergens is low and the irritation is weak, the patient may appear to have localized redness of the skin of the eyelid, and there may be moulting and scabbing of the manifestations. 2. Blepharitis: Blepharitis is an inflammation of the eyelid tissues, often caused by chronic conjunctivitis, contact with irritating substances, patients may be manifested as eyelid congestion, edema, molting and other uncomfortable symptoms, but also can be accompanied by eye pain. It is recommended that patients with significant eyelid redness and swelling seek prompt medical attention to evaluate their condition and treat it under a doctor’s supervision.