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        Illustration: Allergy | Clipart

        Illustration Of Healthy Skin Coming Into Contact With Allergens (On The Left) And The Reaction That Follows Infection (On The Right): Dilation Of Blood Vessels And The Immune Reaction Of Macrophages And Lymphocytes That Migrate To The Inflammation, Followed By The Epidermis Swelling (Oedema) And Shedding Of The Upper Epithelial Cells, From The Getty Images, Universal Images Group Collection. Artwork By Bsip/Uig.

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