Congenital cervical erosion reappear at :

Congenital erosion : The endocervical columnar epithelium grows down from the cervical canal during late intrauterine life to meet the squamous epithelium of the potio vaginalis. whenever the histologic os extends beyond the anatomical os, the cherry red endocervical epithelium appears as well circumscribed erosion around the external cervical os. high levels of maternal estrogen during pregnancy contributes to its occurence. After child bih, this entity undergoes spontaneous remission.Rarely does it persist in later life. A similar lesion may be seen in nulliparous women sometimes who are using OCP s. Shaw's Textbook of Gynaecology 16th edition Page no 171