Without examination ,confirming a diagnosis is tough but it sounds like salivary glands swelling. The major
salivary glands are called the parotid, submandibular and sublingual glands.Submandibular glands open in side
of tongue and sublingual glands open underneath the tongue.
Swelling of these glands leads to interference of production and drainage of saliva and pain and irritation.It
may be due to some obstruction like stone or tumor,inflammation and infection.
In my opinion an examination from an ENT specialist along with investigations like dental x-rays and CT scan
are required.Pls get it done.
Hope it helps.Take care and pls do keep us posted if you have any additional queries. Kind regards.