The swelling arised on your palate can be due to lesions of smoking.
Biopsy of the lesion will help to give an exact diagnosis.
Quit the habit of smoking.
Maintain oral hygiene
Take plenty of water and fluids.
,c,iron and folic acid
tablets has to be administered.
Maintain oral hygiene well.
Rinse your mouth after every meals.
Please do visit a dentist
for further reference.
Hope this helps.