According to the Mayo Clinic, ovaries grow small cysts called follicles every month. These are called functional cysts, which can be of two types namely follicular cyst and corpus luteum cyst. While follicular cyst occurs when the follicle in the ovary doesn’t rupture or releases an egg. It grows until it becomes a cyst, says the health body. On the other hand, corpus luteum cyst is a harmless, fluid-filled mass that originates in the ovaries.
Other types of cysts that are unrelated to the menstrual cycle include:
Dermoid cyst: These form from the embryonic cells, which is why it may contain fetal tissues.
Cystadenomas: These develop outside the ovary and contain a type of fluid.
Endometriomas: Endometriosis refers to when cells resembling the lining of the uterus grow outside the uterus. These can lead to cysts.