Dermoid Cyst: A Patient Guide

Hearing that you or your child has a “dermoid cyst” can be a startling experience, especially when you learn these growths often contain mature tissues like hair, skin oils, and even teeth. While the contents sound unusual, these cysts are well-understood medical occurrences that are almost always benign (non-cancerous).

The term “dermoid cyst” actually describes two broad categories covered by this guide: congenital inclusion cysts, which are typically found in children on the head, face, or spine, and ovarian mature cystic teratomas, which occur in the ovaries of adolescents and adults ^[1][2].

The biological origin of these cysts depends on where they are found. Congenital dermoids occur during early fetal development when a small pocket of skin tissue becomes “trapped” beneath the surface as the body’s layers fuse together. Ovarian dermoids, on the other hand, arise from specialized germ cells that begin to develop into various types of mature tissue without being fertilized. Despite these different beginnings, both types function similarly to the tissues they mimic; for example, the skin-like lining of the cyst continues to produce oils and shed dead skin cells, which slowly fill the pocket over time ^[3][4].

Managing a dermoid cyst focuses on preventing complications rather than treating an aggressive disease. In children, the primary goal is to ensure the cyst does not have a deep connection to the brain or spinal cord before it is surgically removed. For those with ovarian dermoids, the main concerns are torsion (the ovary twisting on itself) or the rare event of a rupture, both of which can cause sudden pain. While it is natural to worry about cancer, it is reassuring to know that malignant transformation—the cyst turning into cancer—is extremely rare and occurs in only a very small fraction of cases, primarily in older patients ^[5][6].

Because these cysts do not go away on their own and can grow slowly, surgery is often considered to remove them permanently, though small asymptomatic ovarian mature cystic teratomas may be monitored. Surgeons prioritize protecting the surrounding healthy tissue, such as preserving the ovary in adults or ensuring complete removal of the cyst’s “track” in children to prevent it from returning. By understanding the specific type of dermoid cyst you are facing, you can work with your care team to choose the best timing for treatment and move forward with confidence ^[7][8].

Note: This guide covers two common dermoid categories. It does not replace individualized medical advice. Always use local emergency services for urgent symptoms.