Allergy is a state of abnormal sensitivity to one or more ordinarily harmless substances.it is an unwanted reaction of after body’s immune system.
Substances that produce allergies are called allergens like pollen grass,dust,,animal hair, certain foods, drugs and cosmetics which are some common allergens.
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Treatment of Allergy : Allergies are curable, but may recur occasionally.The best treatment for an allergy is by avoiding the substances that causes the particular allergy or test against allergic at any specialized medicated center.