The causes of lower lip swelling and ectropion mainly include congenital causes and acquired causes; congenital causes mainly include dental malformation, abnormal jaw development, etc., and acquired causes mainly include bad oral habits, allergies, labyrinthitis, swelling, etc. 1, congenital causes: if this condition caused by congenital causes seriously affects life, cosmetic surgery can be performed to correct the degree of tooth tilt, or to cause abnormal development of the jaw bone for surgical treatment, and it can be restored by no longer stimulating the lower lip after correction; 2. Acquired causes: If there are bad oral habits such as the maxillary front teeth always biting the lower lip, pouting, and tongue topping the lower lip, it will stimulate the swelling of the lower lip, which can be gradually relieved after the behavior control. Allergy can cause the swelling of the lower lip to turn out, and it may also be accompanied by swelling and itchiness in other areas, which can be treated with anti-allergy medication, and in serious cases, seek medical attention as soon as possible. Lip inflammation can also lead to this condition. Patients with lip inflammation can show redness, swelling, erosion, and flaking of the lip mucosa, etc. There are more causes of lip inflammation, which can be treated with wet compresses and ointments in the early stage, and further symptomatic treatment with hormones and antibiotics if severe. If a swelling appears on the lower lip, it is recommended to go to the hospital for examination in time to exclude the possibility of cancer and undergo surgical removal treatment. When the swelling of the lower lip turns out, it is best for the patient to abstain from spicy and stimulating food, ensure enough water and rest, and go to the hospital for treatment as soon as possible when it further worsens.