Allergies are horrible. I say that as a person who's allergic to almost everything on the basic scratch test, and more. Plants, animals, minerals ? all of them can induce reactions from the annoying to the miserable to the health-threatening. That includes nickel, which for years has made some people very, very careful about the type and purity of the metals they allow near their skin. Traditionally that's been jewelry frequently worn. Now it's also mobile devices, including the iPad and iPhone, frequently used.
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