I woke up with a sort of double chin which is kind of lump in the area of the salivary gland. what could it be?

Infection?: Not clear whether the swelling is in midline or one side. Salivary glands in the neck can be inflammed , commonly by bacteria, sometimes viruses like mumps , though less common in adults . Sometimes the enlarged lymphnodes in that area can mimic saliv.Y glands. Also in addition to infection , stones in the ducts of saliv. Glands can make the swel lings, which appear big after eating. See your pcppl.