Or neither?
I'm lucky enough to have no allergies so i'm new to this subject and don't even know first principles.
10m old DS gets a reaction (bright red £2 coin-sized blotches with a little pimple in the middle of each) to egg and oily fish and, to a lesser extent, to tomatoes. At its worst it covers him head to toe, but it seems to vary in intensity a lot. Even though it looks very dramatic, I guess it is mild compared to some of the symptoms i have read about on MN, as he doesn't appear to be that bothered by it.
My instinct is to give him little tastes of these things every now and then to see if there is any change and to build up tolerance. -Have i completely misunderstood how these things work? (By the way, he seems to love the taste of these foods.)
Hugely greatful for any advice...