I had white bumps (they looked like pus sacs) at the back of my throat a few years back and I went to the doctor who prescribed antibiotics and they went away in a few days. Not sure how I got them or what they were (I tested negative for strep throat). and my throat hurt really bad when I had them. Does it hurt to swallow? Seeing you have been on antibiotics for your sinus infection and now you have white bumps, I would go back to your doctor. You may need another round of antibiotics. Have your doctor test you for strep throat too.
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