There is no doubt that your son has recently had an allergic reaction. It is possible that the cause of his allergic reaction was not tested for at his previous visit to an allergist. He needs to be tested specifically for tree nuts, not all tree nuts,but certainly hazelnuts and almonds and also peanut. He should also be tested by a new allergy test called a CAST test. The CAST test is done for possible allergies to colourants and preservatives. He certainly should be tested for possible allergy to blue, red and yellow food dyes and to sodium benzoate on the CAST tests.
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