8 mths ago I had a swollen left tonsil and was given antibiotics. The swelling went away but my tonsil didn't return to normal size. Why is this?

Enlarged Tonsils.. ..tonsils are your body's gateway guards to catch infections from entering...like a sponge it may swell up and cause pain from infections but may still remain swollen (hypertrophied) but normal after the infection is over, it may have to be removed if causing breathing problems or frequent infections and pain or tests showing bad bacteria living there...