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The white spots
over the back of your throat could be follicles caused secondary to the inflammation of the throat. The white spots were the pus filled spots which eventually got out when you took the magnesium citrate
The large bumps noticed on the back of the tongue are nothing but group of taste buds
and the lingual tonsils
, which are normal. Indeed, you can reduce the inflammation over the lingual tonsils by drinking plenty of warm water, avoiding chilled beverages and coffee for few days.
Wish you good health