As a result, dermoid cysts often contain tissues such as hair, skin or
teeth. Dermoid
cysts are rarely a cancerous cyst, but they can become large
and painful
and can cause your ovaries to twist, causing pain.
A second type of complex ovarian cysts, known as an endometrioma, typically develops as a result of endometriosis. In endometriosis, uterine cells grow outside the uterus. Uterine tissue therefore has the potential to attach to your ovary and form a growth.