See white spots
can be Tonsilloliths or may be because of Acute follicular tonsillitis
U said U are on antibiotics so less chance of the 2 nd option.
But still if u have pain ,fever
,painful swallowing then there are more chances for the 2nd option.
So do see your doctor.
u can start gargles with lukewarm saline 1 glass with 1/4 spoon of table salt 2 times a day.it will give u soothing effect and also relieves edema and clears the whitish spots by cleaning.
Gargle with Betadine
gargle 2 tsf in half glass of water 3 times a day.
I donot know which antibiotic u are on..but if there is no pain or fever relief then do change it after consultation to ur GP/ENT specialist