Thanks for your query. Novocaine
as a drug usually does not have any side effects resulting in yellowish cluster of bumps. But after reading your symptoms I feel that the clusters may be due to trauma during the oral surgery
due to pressure applied by the instruments which can happen as you were under anesthesia
I would suggest that you give it a week and massage
with any normal lip gel. If after a week the problem still persists then please visit your surgeon for an examination.