Bartholin's cyst is caused by:

Fluctuant non-tender swelling at the introitus suggests a diagnosis of bartholins cyst. Bartholin's cyst: It is the most common cyst of the vulva. Bartholin's' cyst are produced from the accumulation of secretions of Bartholin's gland. The cyst may develop either in the duct (more common) or in the gland Etiology: Cyst formation occurs due to the obstruction of the main duct or opening of an acinus. The cause of obstruction is usually fibrosis which follows either infection or trauma. It was formerly believed that the infection was invariably gonococcal but almost any organism can be responsible. Left Bartholin' gland is more often affected than the right. Presentation Usually presents as a unilateral swelling that bulges across the vaginal introitus. Size of the cyst rarely exceeds hen's egg. Swelling is present characteristically on the inner side of the junction of the anterior 2/3rd with posterior 1/3rd of the labium majus. The swelling is fluctuant and usually non-tender. The patient may present with discomfort, dyspareunia, or infection. Treatment of choice is Marsupialization: It is preferred over traditional excision operations.