It is generally believed to be caused by incomplete formation of the ear chakra during embryonic life or overdevelopment of the cartilage in the ear nail. It is more common bilaterally. In normal ears, the angle between the auricle and the ear canal is 90 degrees, while in patients with aural malformations, the angle between the auricle and the ear canal is greater than 90 degrees, usually above 150 degrees. In order not to affect the normal psychological development of children, the surgery is usually performed at the age of 5-6 years. The principle of correction: re-formation of the pair of ear whorls and their upper and lower feet, reduction of the width of the wall of the ear nail so that the distance from the ear whorl to the mastoid is less than 2cm. Commonly used surgical methods: Mustarde method, Stentrom method, Converse method, the latter being the commonly chosen procedure at present.