Yesterday I had the first of four weekly tests to determine what I’m allergic to. This consists of getting five pieces of jagged plastic twisted into the sensitive pasty flesh of my forearm and waiting for the wounds to erupt.

I had mild reactions to cat and dog (bad for me, but manageable). I also reacted to household dust and molds. The worst, though, was histamine. My body is producing enough of the stuff to create a welt the size of a small volcano.

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