Welcome to healthcaremagic forum.
The lump at the jaw may be caused due to abscess
developed due to deep caries/periodontal infection/impacted wisdom tooth
I would suggest you to get a thorough clinical as well as x-ray evaluation done.
Impacted teeth has to be either extracted or retained depending on severity of lesion.
along with analgesics.
If symptoms persists,please do visit an ENT specialist
Hope this helps.