As u told me about your problem,i think its a salivary gland
infection. may be its baterial infection(also called sialadenitis
) cause pain. fever
and abcess. Bacterial infection is generally one-sided salivary gland swelling.Also u told me you have white spot on gland, if this spots hurts and you notice a swelling around it, it can be oral infection.Warm saline gargles would help with this. or if it doesn't pain and adherent to surface , it can be leukoplakia(precancerous stage) and needs to be seen by a doctor. stop tobacco chew, it is harmful to you. you can take antiboitics tempararily. and kindly visit your dentist
and Ent specialist
as soon as possible..
Have a nice time... take care