An allergy is a scenario where the immune system fights off a perceived threat that would otherwise eventually cause the breakdown of skin or other localized tissue.

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An allergy is an immune system response to a foreign substance that's not typically harmful to your body. These foreign substances are called allergens. They can include certain foods, pollen, or pet dander. The immune system's reaction to an allergen can cause symptoms like sneezing, itching, and a variety of other responses. It is not specifically about fighting off threats that would cause the breakdown of skin or other localized tissue.

An Allergy Is a Scenario Where the Immune System Fights