Abstract: Lip defect, in addition to cause facial appearance deficiency, often causes facial dysfunction, such as eating inconvenience, language incompetence, difficulty in chewing, slobbering, etc., which brings great pain and financial burden to the patients. Lip defect generally refers to a full-thickness composite tissue defect, which can be caused by congenital disease, inflammation, trauma, or tumor. Lip malignancy is the major cause of lip defect after tumor resection. However, the surgical level of repair technique after lip cancer resection is uneven, and lack of uniform standards to classify the different defect degree. Meanwhile, the confusion of treatment protocol results in postoperative deficiencies of lip shape and function, in other words, increases the patient's economic burden. Therefore, in order to standardize the diagnosis and treatment techniques for lip defect, to improve the therapeutic effect, as well as to reduce the waste of medical resources, it is urgent to work out expert consensus on lip restoration and reconstruction.

Key words: Lip defect, Lip tumor, Lip deformity, Reconstruction, Expert consensus