I've heard that taking regular sitz baths will reduce Bartholin's cysts. Is this true?

Yes. "hot" or warm baths will improve almost any inflammatoy problem as the heat will dilate you blood vessels and proide increased blood supply which is one of the most needed "body action" in the healing process. Dr. J.
Indeed, plus. Sitz baths can also help improve symptoms from an existing bartholins cyst. Hope you feel better.