Medically reviewed by Cordelia Nwankwo, MD Key Takeaways Umbilical endometriosis, when tissue grows inside the belly button, causes pain and may require surgery.You should see a doctor if you notice a ...

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Add Yahoo as a preferred source to see more of our stories on Google. One of the dirtiest places on the human body is not your butt or mouth. No, the honor goes to an often-forgotten hole: the belly ...