If there's even a chance that it might be an allergic reaction to the medications, you do want to contact a doctor - it's rare, but sometimes those can be serious or even lifethreatening. Of course, it also might be fine and controlled with occasional Benadryl. Knowing the difference is what the experts are for.
(FrancisAnn : Anything that needs antibiotics to clear up is an infection, which by definition means it's not an allergic reaction. Could be coincidence?)