what causes a mucocele
Mucocele Causes. It is usually caused due to obstruction or rupture of a salivary gland duct in the mouth, which results in the swelling of a part of the gland. This condition is also known as the ranula. Here are some common causes that are associated with the formation of a mucocele, .1  Mouth injury may result in the damage to the duct, which in turn may result a mucocele. 2  Habitual biting of the lip and other mouth areas may also increase the risk of injury to the duct.ucocele may often go unnoticed, however some individuals may report certain symptoms, that may arise due to discomfort. However in most cases, the condition is completely painless. 1  A small bump most often under the tongue is observed. 2  A bump may also be observed on other areas, along the floor of the mouth.