These are in ovary
Dermoid cysts are benign(non-malignant) cysts that are in the ovary, not the uterus
although large cysts can push into the uterus.
They develop from eggs that begin growing without being fertilized and develops hair, teeth and other structures. They can twist, causing severe pain and often need to be removed to relieve the pain. They are sort of a "freak" of nature but totally benign.