What Causes Bumps On The Roof Of The Mouth On Taking Naprasyen?

i am 22 y old i had a sore throat and then i went 2 doc and he told me it was bac or viral and so i got sent home and then i took naprasyen for about a week sore throat is gone but i got bump that i wok up with on roof of mouth ???the 1 on right side went down and is nerly gone but now i have grew 1 on the other side in the same place and its bigger seems to be growin and i am gettin various bumps sprout up all of a sudden wt could it be im nerveus???? the bumps are toward the back and large right bye the bone at the last tooth on top of mouth