How long can the swelling of the lips go down, it depends on the cause of the swelling of the lips different swelling time also varies. If the swollen lips are caused by mouth ulcers, you can take oral tablets to promote the healing of the ulcers, and the swelling of the lips can completely subside after the ulcers heal, which generally takes a week. Second, if the patient eats food-induced allergic edema, the patient can take oral anti-allergy drugs such as loratadine at this time. Generally the swollen lips can slowly subside after 3-5 days. Third, if the patient suffers from soft tissue damage to the lips caused by trauma, accompanied by a small amount of local bleeding, local pressure is needed to stop the bleeding. Local ice packs are applied within 24 hours, and after 24 hours, oral bruising pills and blood-stasis tablets can be taken to improve the swelling of the lips, which generally takes two weeks to reduce the swelling of the lips.