The presence of redness, swelling and itching in the lower eyelid requires careful observation of the clinical signs in the lower eyelid area. If the itching appears periodically, will subside within a few hours, there is no obvious skin flakes on the surface, purely swelling, itching, consider that there may be allergic factors caused by angioneurotic edema, itself belongs to a subtype of urticaria, which belongs to the allergic factors, you can choose to take cetirizine hydrochloride tablets orally, together with cold water ice compresses or glycerol detergent topical application, and oral prednisone if necessary, will soon subside this symptom. The symptoms will soon subside. If the redness, swelling, itching persists, the surface of the obvious peeling, considering the possibility of allergic factors formed facial dermatitis, it is recommended to choose oral loratadine tablets, and in the local application of dehumidification and anti-itching cream, to reduce the number of late nights, and eat less seafood and other allergy-prone food.