The skin of external auditory canal cartilage has cerumen gland, and its yellowish viscous secretion is called cerumen, commonly known as earwax. After drying in the air, the earwax is flaky; Some are like sticky grease, commonly known as "oily ears". Cerumen has the function of protecting the skin of external auditory canal and adhering foreign bodies. Usually, with the help of chewing, mouth opening and other sports, earwax is discharged by itself. If cerumen gradually condenses into a lump and is blocked in the external auditory canal, it is called cerumen embolism.