Vaginal cysts usually don't cause symptoms. If you have one of these cysts, you might feel a small lump along the vaginal wall or on the lips. Often, your gynecologist will discover the lump during your annual exam. The cyst might stay the same size or grow larger. The cyst shouldn't be painful. However, some larger cysts -- especially Bartholin's gland cysts -- can cause discomfort when you walk, have sex, or insert a tampon.