A mucous cyst (mucocele) is a fluid-filled swelling on the lip or mouth that develops when salivary glands become plugged with mucus, often due to trauma like lip biting, cheek biting, or piercings.

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NBC Selected independently determines what we cover and recommend. When you click on or buy through our links, we earn a commission. Learn more. Zoe Malin Reporter Finding an ingrown hair after ...

Shoulder lumps can result from harmless causes like lipomas (fatty tissue growths), cysts, muscle knots, or large pimples, though injuries, arthritis, and rarely, cancer can also cause them. Most ...