Hello and welcome to HCM,
Sad to hear that you do not trust the doctor but do not worry, if the doctor would have found anything serious, I am sure he would have suggested further tests right away.
Since you have already removed your tonsils you do not have anything to worry about near the uvula
as they are not related. If the pimple like thing comes frequently then you may need to stress
on the doctor to get more test done so that it can be cured permanently.
If you do not have any pain, and the spot is not becoming red or bigger or painful then you might as well wait for a week for the spot to disappear. If this does not happen and your symptoms worsen then do see the doctor and start definitive treatment
hope this helps
wishing you a speedy recovery
Dr Sriram Nathan