Labial fusion, or labial adhesion, is when the small lips around the entrance to the vagina become sealed together and covered with a fleshy membrane. It is sometimes seen in babies and young girls and is usually nothing to worry about.
The membrane usually completely seals the vaginal opening, leaving a very small gap at the front through which urine passes.
For most babies or girls, labial fusion does not cause any problems and is often discovered accidentally by a parent or carer during nappy changing or bathing.

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