Back to Health A to Z. A Bartholin's cyst, also called a Bartholin's duct cyst, is a small fluid-filled sac just inside the opening of a woman's vagina. You may feel a soft, painless lump. This does not usually cause any problems. But if the cyst grows very large, it can become noticeable and uncomfortable. You may feel pain in the skin surrounding the vagina vulva when you walk, sit down or have sex.
NCBI Bookshelf. Catarina Quaresma ; Paul B. Authors Catarina Quaresma 1 ; Paul B. Sparzak 2. Danish anatomist Caspar Bartholin Secundus first described them in
They make a small amount of fluid that lubricates the vaginal lips. If a flap of skin grows over the opening of one of the glands, the fluid backs up. It causes a round swelling called a cyst. The cyst can grow from the size of a penny to larger than an orange. Cysts can be tender.