Vaginal cysts usually form when a gland or duct becomes clogged, causing liquid or another material to collect inside. The cause of a vaginal cyst depends on its type. Inclusion cysts are caused by trauma to the vaginal walls. For example, women may get an inclusion cyst after they have an episiotomy (a surgical cut used to enlarge the vaginal opening during childbirth) or when they have surgery that damages the lining of the vagina. Bartholin's gland cysts are caused when the opening to the Bartholin's gland becomes blocked -- such as by a flap of skin -- creating a fluid-filled growth. An abscess can result from a number of bacteria including those that cause sexually transmitted diseases such as gonorrhea or chlamydia. Bacteria normally found in the intestinal tract, such as E. coli, can also lead to Bartholin's abscesses.