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A percutaneous test punctures or pricks the skin. Small drops of allergen are scratched into the skin near the surface. It's useful for diagnosing sensitivity to pollen or mold, dust mite waste, or animal dander, and others. "In some cases, food allergy reactions are localized. Fresh fruits and vegetables cause some to experience tingling in the mouth. The cause is supposed to be proteins similar to those discovered in ragweed pollen."

In response to contact or ingestion, the body releases an antibody called IgE (immunoglobulin E) seeing as it sees the food not while nutrition, though a foreign invader. The antibodies stimulate the release of histamine, prostaglandins and other compounds that merchandise the symptoms. Like any other allergy, a food allergy occurs when the immune scheme overreacts to an allergen. In this case, the allergens are more often than not milk, eggs, peanuts, shellfish and a whole lot other foods.
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