The salivary glands in the mouth secrete saliva in order to keep the mouth moist, aid in digestion, and help protect the teeth from decay.

Saliva moves into the mouth from the salivary glands through tiny tubes called ducts. When a duct is injured or becomes blocked, a mucocele can form.

Mucoceles are common, occurring in approximately 1 out of every 500 adults. Mucoceles are often caused by trauma or lip biting. In other cases, certain medications may thicken the saliva, resulting in blocked salivary ducts.

How do mucoceles form?