Thanks for writing to us.
The fluid filled white bumps are abscess
,which developed due to-chronic cheek biting/deep caries/periodontitis
I would advice you to get a thorough clinical as well as radiological evaluation done by a dentist
to rule out cause of bumps.
The pus has to be drained and curetted.
along with analgesics.
Rinse your mouth after every meals.
Brush and floss your teeth daily.
Swish with warm saline frequently.