Salivary Gland: A translucent watery blister under the tongue is most likely a mucous retention cyst, mucocele, or ranula which occurs when the duct of a salivary gland becomes occluded. The gland continues to produce saliva and cannot empty into the mouth, resulting in a ballooning effect of the duct or gland depending on the location of the blockage.
Answered 10/4/2019
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