Thanks for asking the query,
As per your clinical history I suppose that lump in the cheek can be due chronic cheek biting
habit which is causing trauma to the cheek mucosa resulting in formation of cyst or an beningn fibroma
Other than this it could be due to any root piece left at the time of wisdom tooth removal which is now causing abscess
formation leading to formation of lump.
I would suggest you to visit a Dentist
and get a thorough checkup done,
Take an OPG radiograph, beningn lump which is causing discomfort can be excised surgically.
Go for symptomatic treatment of complete mouth scaling and polishing.
Maintain a good oral hygiene
, use antiseptic mouthwash gargles twice daily.
Hope this helps out.