The swelling of urticaria is mainly due to the edema of the soft tissues of the skin after the patient has developed allergy. The edema is mainly due to the degranulation reaction of the mast cells in the dermis of the skin tissue, and the inflammatory mediators such as degranulated histamine may stimulate the capillaries of the surrounding tissues and the soft tissues causing itching, and at the same time, it will also produce significant tissue edema, and the swelling of urticaria can be seen from the appearance of the swelling. The swelling is in fact a further development of the cluster. This phenomenon can be treated with topical topical application of Furamyl lotion and also with oral antihistamines, which can be taken orally as second-generation antihistamines, such as oral levocetirizine hydrochloride.