If you are showing signs and symptoms of an allergic reaction towards
sugar,then you can confirm it by allergy testing.Skin
test or patch
test is used for this purpose.This test involves pricking, scratching or injecting food extracts into the patient’s skin. The skin will react with redness and swelling for those extracts capable of eliciting an allergic reaction when consumed.Other tests used are blood tests like RAST and food challenge tests.