You know, if someone actually was having to epi themselves or their child once a week, as you suggest, they likely really need to review their management practices.
Upon further reflection, I said that I wouldn't epi for just a rash. That's not necessarily true. If I had a rash and found out that I had somehow consumed something with apple in it, I would go ahead and epi, no waiting, no questions asked. But that is my plan (approved by a board certified allergist), and if I've come into contact with something with apples, I've played this game enough times to know where it is going.