My daughter has really bad reactions to poison ivy/oak/sumac. All she has to do is walk near it and she reacts to it. We tired everything for her...she even gets hives in her mouth and nose and other internal areas
.....we use Aveeno oatmeal baths and she has to go get prednisone to get relief.
The benedryl may help and also the Benadryl ointments.
Good Luck!!!