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A person's shoulder, showing red blotches
Image: UIG/imago imagesImage: UIG/imago images

Allergy

Allergies, such as hay fever, happen when a person's immune system over-reacts to an "allergen." Allergens are found in household pets, dust mites and other insects, pollen, food, such as nuts, and medication.

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Scabies Mite - Krätzmilbe