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Background:Auricular pseudocyst,which is also called serous perichondritis of the auricle,is an aseptic local serous inflammatory mass in the perichondrium of the auricle.The cause is unknown.It is difficult to be cured with a chronic course,and might transform into suppurative perichondritis because of incorrect treatment such as repeated puncture,and even necrosis occurs,resulting in deformation of the external ear.