Systemic contact dermatitis to nickel present in cocoa in 14-year-old boy.

Systemic contact dermatitis can be elicited in nickel sensitive individuals by oral nickel exposure from food with high content of this metal, such as cocoa. We present a case report of a nonatopic teenager who developed allergic contact dermatitis due to nickel, cobalt, copper, and palladium, but exacerbations of skin lesions were mainly related to cocoa consumption.