Hello & welcome
First of all i should make it clear that this is not related to fried food in any way.
information is little insufficient still on this basis it can be either lichan planus or leukodema.
If you are also feeling slight burning sensation and vesicles at the site it can be lichan planus for that you have to avoid spicy food, & to reduce stress
level if any.
ointment thrice daily.
If white bump faded while stretching cheek it can be leukodema and no treatment required.
Still i will advise you to visit your dentist
for a through checkup.
thanks & take care