There are 2 pairs of labia of the female private part. Also called the outer lips and the inner pair of lips.
This is the outer pair of lips that is larger size and cover the smaller inner pair of lips in young girls. This means that in the non sexually active young female, the labia minora is hardly visible. However, after the child birth and pregnancy, the inner labia may becomes larger and elongated. Thus, it may protrude the covering of the outer lips. Further, the good volume fat filled outer lips may suffer wrinkled skin after thirties due to decreasing fat volume and thus exposing the inner lips.
This is usually small during teenager years but turned darker and elongated after pregnancy and childbirth.
This is normally just a thin strip of mucosal covered sensitive organ that abut the entrance to the vagina during teenage year. The size increased after pregnancy considerably.
This is usually pinkish color during teenage years but becomes heavily pigmented with dark color after pregnancy due to the effect of estrogen.
Due to the increased size and length of the labia minora, the inner lips, it obstruct the proper urination. This cause collection of the smegma like material within the creases of the labia and causing odor and unhygienic if not adequately and frequently cleaned.
The other is the cosmetic reason. The dark coloration is not pleasing to many ladies and preferred to get it removed.
This is a simple and safe surgery to trim the size of the inner lips so that it looks better.