Painful lump under jaw

Hello, my brother has this hard lump of some sort kind of a painful lump under jaw that appeared out of nowhere.

The painful lump under jaw is located right under the chin, a little above the Adams apple. and it is very swore to the touch, do you know what this is??

He’s a Diabetic, recovering addict ( oxycodon ) for the past 9 months, Occasional “pot” smoker. P.S. Thank you for you’re time.

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