Hi welcome to Health care magic forum.
Thanks for calling.
It is probably the result of the infection of the interior of the jaw, may be the tooth,gums, or bone. as there is loose tissue, of the jaw, the debris of swelling is collected in the jaw tissue. When it exceeds the loose tissue, it starts paining, and increase day by day.
So it is better to consult a dentist
, or a surgeon for diagnosis and treatment.
You may need to use anti biotic, antiinflamatory and prtiolytic for complete relief.
i wish you a speedy recovery.