DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Mucous retention cyst. Close-up of a mucous retention cyst or mucocele on the back of a 57- year-old female patient's mouth. Mucoceles are usually benign and decrease over time, but if they cause pain or affect swallowing they may require treatment or surgical excision.
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