The squamocolumnar junction, where the columnar secretory epithelium of the endocervical canal meets the stratified squamous covering of the ectocervix, is located at the external os before puberty. As estrogen levels rise during puberty, the<unk>  os opens, exposing the endocervical columnar epithelium onto the ectocervix. This area of columnar cells on the ectocervix forms an area that is red and raw in appearance called an<unk> <unk>  erosion). It is then exposed to the acidic environment of the vagina and, through a process of squamous metaplasia, transforms into stratified squamous epithelium.
Cervical ectropion
Genital wart
Varicocele
Imperforate hymen
Buried penis
Bifid penis
Supernumerary nipple
Hematocele