Cleft lip, commonly known as rabbit lip and mouth opening, is a common congenital malformation in oral and maxillofacial region, and its incidence rate is about 1: 1000. Normal fetus, after the fifth week, began to gradually merge with some embryonic processes to form a face. If it can't develop normally, it can be deformed. The reason is not completely clear, which may be related to nutrition, heredity, infection, endocrine and other factors. It has a great influence on facial appearance. According to the location and degree of cleft, it can be divided into unilateral and bilateral, complete and incomplete cleft lip. It is generally believed that the operation of unilateral cleft lip is appropriate in about six months, and the operation of bilateral cleft lip is a little late. The basic conditions for children to adapt to surgery are: general health, no obvious anemia, no upper respiratory tract infection, and no infection in local and surrounding tissues. Cleft upper lip at birth is called cleft lip. Cleft lip can be manifested as a small notch from the red lip of the upper lip to the complete cleft extending to the bottom of the nose, and the cleft can be located on one side or both sides. Because the lip or palate is separated during development, a baby may be born with cleft lip, cleft palate or both. To repair the cleft lip, repair the cleft lip. However, secondary deformity may occur after cleft lip repair. This is because the tissue arrangement is a little missing during the operation, and there will be obvious deformity in adulthood. The most common secondary deformities after cleft lip repair are as follows: 1, and the upper lip arch is not obvious: the normal upper lip has beautiful lip arch lines, but the postoperative cleft lip often does not have the obvious characteristics of the normal lip arch due to irregular tissue arrangement. 2. lip bead's absence: The middle part of the normal upper lip is obviously protruding, but after the cleft lip operation, due to the poor alignment of the red lip tissue, the normal lip bead is missing, and even a small incision appears. 3, alar collapse: due to the dysplasia of alar cartilage on the affected side, it is often manifested as alar collapse, accompanied by nasal columella deviation and low tip. The above is the analysis of cleft lip by Quanzhou Yixing plastic surgery experts. Yixing plastic surgery experts remind you that if you want safe surgery and achieve ideal results, you must choose a formal plastic surgery institution. If you have any other questions, please click to consult Quanzhou Yixing plastic online experts for free. They will give you detailed answers and give you the most objective suggestions and beauty programs.