What is it?
A cyst is a sealed sac made up of bodily tissue. This can be found in or around the walls of the vagina. The sac can be filled with air, fluid or other material. There are different types of vaginal cysts. Inclusion cyst (most common) is usually after injury or damage to the vagina which has not healed properly. Bartholin’s cyst, when Bartholin's ducts (which lubricate the vagina) becomes blocked and then fills with fluid or pus and becomes a cyst. Gartner's duct cyst is another duct which becomes blocked, but this duct is usually only active during pregnancy. Endometriosis is from growths of uterine material that form outside the uterus, which can also form small cysts in the vagina.
It is not clear why cysts develop. Bacteria can sometimes infect a cyst, causing it to fill and swell. Cysts can form anywhere in the body, including the walls of the vagina.
You should always see your GP if you notice a cyst in or around your vagina. They may recommend soaking it in warm water several times a day for a few days, or for more serious case a small surgical procedure.