Hello, There are many possibilities from your description including tumor, salivary stone, cyst, virus, and allergic or traumatic reaction. Your mother has been advised to see you specialist and I assume she has followed this advice. Has she had a biopsy since you are waiting to see a letter? The clinical exam and pathology report will provide detailed information and determine a correct treatment path. Try to be patient and wait for a diagnosis rather than worry about possibilities. I suggest your mother maintain good daily hygiene. It is very important to maintain a proper diet with balanced vitamins and keep well hydrated. Avoid any deficiencies. Avoid irritants such as smoking or alcohol. Thank you for your inquiry. I understand you are worried and hope that the waiting period is not too long.