A Bartholin's cyst, also called a Bartholin's duct cyst, is a small growth just inside the opening of a woman’s vagina. Cysts are small fluid-filled sacs that are usually harmless.

A Bartholin's cyst can stay small and painless and may not cause any symptoms. However, the cyst can become infected, which can cause a painful collection of pus (an abscess) in the Bartholin’s gland.

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