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Among the for the most part common and effective methods used to test for allergies are skin or prick tests. These procedures inject or insert a little quantity of potential allergen - pollen extract, solution containing animal dander proteins and others - under the skin. ... read more
Fortunately, when allergic reactions do occur, there are many effective treatments. "For all these and more, there is symptom relief and for some potentially a long-term elimination of the risks."

An allergen is any substance that produces an allergic reaction. Still that sounds circular. To flesh it out a miniature uncomplicated science is all that's needed. SKIN TESTS
natural asthma treatment - allergy relief products 2. Gold in the form of gold sodium thiosulfate