None I'm aware of: Erythema toxicum is a transient condition affecting 1/3 to 1/2 of newborns & is relatively easy to diagnose on exam. I don't need a confirmatory test. Microscopic exam of some of the tiny blisters will yield eosinophils, a white cell associated with allergy.It's a cute test but i haven't done one since medical school.
Answered 5/27/2012
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