Painful swollen lump in front of ear jaw from tooth abscess?

Infection. An abscessed tooth is a badly infected tooth. Infection may be spreading to, and causing swelling of, lymph nodes. The best way to rx this problem is to eliminate the abscess through root canal rx (preferable) or extraction. Please see your dentist now before infection spreads farther.
The sructures in. This area include the parotid gland and lymph nodes. Infection in the gland is a possibility especially if it increases in size when you eat. See an ent.
Unlikely. Not likely in that area. See oral surgeon or ENT doc for exam/treatment.