Why is skin-testing for allergies done? Skin-testing is a method that doctors use to see whether a patient’s exposure to specific substances provokes an allergic response. Extracts (i.e. material used for allergy testing) are made from common allergens like various plant source (e.g. grass, trees, and pollen); mold spores; animal dander; cockroach or dust mite debris and certain foods. Read More...