Swollen lips may be caused by the following reasons: first, allergies to the lips, when the lips are exposed to allergenic food, drugs or lipstick, lipstick cosmetics, resulting in vasoneurotic edema of the lips, which will cause the lips to swell and tighten rapidly in a short period of time. Secondly, the lips are caused by trauma, because the lips are very rich in blood vessels, the tissue is very loose, so once the trauma will lead to the lips swollen especially obvious, then go to the hospital in time for local tissue debridement suture. If the swelling of the lips is chronic, it is possible that the patient is suffering from chronic lip infection, which is mostly caused by vitamin deficiency in the body, resulting in dry, cracked, flaky and thickened lips. For patients with chronic lip inflammation, first of all, they should replenish sufficient vitamins, in addition to applying lip balm to keep the local moist. If the chronic lip inflammation in the lips does not heal for a long time, it needs to be treated by applying local ointment under the guidance of a doctor.