Allergen is any substance, most often eaten or inhaled, that recognized by the immune system and causes an allergic reaction consumptions act or process of consuming cumulative  increasing or enlarging by successive addition  Dander the outer covering of an animal dermatitis inflammation of the skin dust-mites Microscopic arachnids that live in dust, and who's body parts are highly allergic eczema a noncontiguous inflammation of the skin, characterized chiefly by redness itching, and the outbreak of lesions that may discharge serious matter and encrusted and scaly. exposure an act or subjecting or an instance of being subjected to an action or influence. hypersensitivity highly or excessively sensitive. Fungi are types of parasitic plants that include molds, mildew, and yeast Mold spores reproductive bodies of mold Pollutant to raise to an more important or responsible job or rank significant having or expressing a meaning  Symptoms are the causes of a disease or a group of diseases