Just becuase your test positive to being allergic, does not mean that you are severely allergic, just that your body is reacting to it in some defensive way.
For example, I am 'allergic' to chocolate. I literally have to eat like 2lb of chocolate to elicit an effect, which is pretty much just a minor cough.
P.S. I'm allergic to EVERYTHING. My arms get lit up like a christmas tree when they do those tests.