What Is a Dermoid Cyst? A dermoid cyst is an abnormal growth of non-cancerous tissue under the skin. These cysts may contain hair follicles, skin tissue, sweat, and oil. Sometimes cysts also contain ...

BOSTON - Dr. Mallika Marshall is answering your latest health questions. If you have a question, email her or message her on Facebook or X (formerly known as Twitter). Jeanne writes, "I have a Baker's ...