Bilateral auricular defects are caused by trauma or infection, and have their own characteristics when compared with tissue defects in congenital microtia, such as localized skin is often scarred, with poorer blood supply, elasticity, and laxity. It is not possible to make a thin subcutaneous extensive peeling, it is not easy to form a wide and loose cavity that can accommodate the implanted stent tissue, therefore, it is often difficult to clearly show the contour shape carved on the stent. Bilateral auricular defects can be caused by trauma, burns, tumor removal, etc., and are diagnosed as follows: 1. History of trauma or infection or surgical removal of a tumor; 2. Auricular defects, often with more scarring, poorer elasticity, blood supply, and laxity of the surrounding skin; 3. Often part of the ear nails and external auditory canals are left behind; 4. May be combined with other deformities. Differential diagnosis is needed with the following symptoms: Bilateral auricular hypoplasia Auricular hypoplasia generally refers to congenital microtia, which is caused by the incomplete development of the first and second gill arches or the first gill sulcus in the process of embryonic development, and may be accompanied by the first pharyngeal bursa insufficiency caused by the pharyngeal eustachian tube, tympanic membrane, or mastoid malformations. Laceration of the auricle and ear canal Laceration of the auricle and ear canal is a clinical manifestation of ear trauma. Auricular trauma can occur alone or be associated with trauma to adjacent tissues, with contusion and laceration being the most common. Enlargement of the auricle is the enlargement of a limited cyst on the ventral side of the auricle of undetermined cause, which is called pseudocyst due to the absence of epithelial layer in the wall of the cyst. The majority of patients are male, and the age of onset is usually between 30 and 40 years old, mostly occurring on one side of the auricle.