Cervical erosion occurs when the epithelium inside the cervical canal grows outward to the external orifice of the cervix and the cervical part of the vagina, replacing the original epithelium of the external orifice and vaginal portion. The outward-growing epithelium from the cervical canal appears bright red, which visually resembles erosion, hence it is called cervical erosion. As the migration of the endometrium from the cervical canal is a physiological phenomenon, with increasing age, the migrated endometrium gradually retracts back into the cervical canal. Therefore, upon detecting cervical erosion, it generally only requires cytological screening and does not need treatment.