At this point in your care, it sounds like you have been taking the appropriate steps towards resolving your question: you've seen a physician, and are looking for more answers. The most appropriate physician to follow up with would be an Ear-Nose-and Throat Surgeon
(AKA ENT AKA otolaryngologist
), who is used to this sort of problem and can review your past medical history, family history, and ask you the appropriate questions to make sure that this mass is not something that you need to worry
about. Until you have been assured by a qualified physician that the mass is NOT something you need to worry about, you need to worry about any new mass. While you are not in the normal age range of patients who present with malignant masses (ie, cancer), it is important to follow up appropriately to make sure. It is important to know how long it has been there, if there are any other symptoms (such as pain with chewing, weight loss, etc), and if it is growing in size. As for the salivary glands in your mouth, there are many of these scattered throughout your mouth, most small but several larger ones that empty into your mouth through ducts. A physical examination should be able to localize the affected area and give you more insight.