hello and welcome to Health care magic,
I am Dr Sriram Nathan and I shall try to help you out with your problem
The bump around the retromolar trigone are since is of a short duration can be due to many causes most of which are benign and harmless so you do not have anything to worry about.
You may start a course of anti reflux medication
, along with an antihistamine like levcetrizine. Your doctor will know about these.
Since it hurts then you may also have an infection in the area. Try an antibiotic like the amox-clav in consultation with your doctor.
get a dental consultation and see if there is anything like a jagged teeth which is irritating the area
Take only non spicy, non oily and warm food and fluids
take proper meal at proper and correct time. Do not immediately lie down after food.
Take a course of multivitamin
in consultation with your doctor
If you do not get better in a week or so then you must consult an ENT doctor who may advice further course of action which may include endoscopy
and may be even biopsy
to get a better picture
take care and do not worry
Dr Sriram Nathan