Allergies (100 pack)

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Allergies occur when your immune system reacts to a foreign substance — such as pollen, airborne particles or pet dander — or to a food that doesn’t cause a reaction in most people . Your immune system produces substances known as antibodies. When you have allergies, your immune system makes antibodies that identify a particular allergen as harmful, even though it isn’t. When you come into contact with the allergen, your immune system’s reaction can inflame your skin, sinuses, airways or digestive system. Show more