Allergens are the substances that bring about allergies. They are everywhere around us and we are only allergic when our body has interacted with the substance and starts reacting.
Allergens are the substances that can cause allergies. Technically, an allergen is a non-parasitic antigen capable of stimulating a Type-I hypersensitivity reaction in atopic individuals. In layman’s terms, an allergen like pollen or a chemical is what causes people with allergies to sneeze or have an “allergic reaction”.