Hidden ear, also known as buried ear and bag ear, is a congenital auricle development deformity. The main manifestation is that the upper part of the auricle is buried under the skin of the temporal scalp, and there is no obvious posterior auricular groove: pulling the upper part of the auricle outward with your fingers can reveal the whole auricle. This kind of deafness is more common in Japan, but less common in China. It is rare in Europe and America, and the deformity is mostly male. The ratio of male to female is about 2: 1, which is more common on the right. The left-right ratio is 2: 1, and bilateral malformation accounts for about 40%.