Some children and adults are allergic to nickel and develop rashes when they come in contact with it. They also may react to foods--including peanuts, chocolate, oats, and processed American cheese--that contain a significant amount of nickel.
A new Pediatric Dermatology study presents 4 clinical cases of hypersensitivity in children due to chocolate consumption at Easter. They all developed dermatitis flares approximately 48 to 96 hours after the holiday and admitted to binging on chocolate during their Easter Egg hunts.
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Pediatric Dermatology