Allergic reaction

Last week Heisman had an ear infection (only his 2nd one) so I was giving him amoxicillin.  After a week of medicine, he broke out in hives!  I took him back to the doctor and it turns out he's allergic to amoxicillin.  Luckily his ear infection was cleared up so he didn't have to switch to a different medicine.  So I just stopped giving him his medicine and he gets some benadryl to help with his hives.  He is acting normal and doesn't seem to mind the hives.  Thank goodness because they look horrible!  Poor guy :(