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Allergen

Medical term · A

A substance such as fur, pollen, or dust that produces an allergic reaction.

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Related terms

Allergic

Having a sensitivity to one or more normally harmless substances.
Contact dermatitis

A rash or skin irritation that results when skin contacts an allergen or irritating substance.
Histamine

A substance released by the immune system when it is exposed to an allergen. Histamines cause many allergy symptoms.

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