Abstract
Systemic contact dermatitis from the cashew nut shell oil resorcinol allergens cardol and anacardic acid is recognized clinically as a dermatitis with flexural accentuation, typically distributed on the extremities, groin, and buttocks, and occurring generally 1 to 3 days after ingestion of raw cashew nuts contaminated with allergenic oil. We report a case of systemic contact dermatitis to raw cashew nuts, an atypical and unexpected ingredient flavoring an imported pesto sauce. Plants with allergens that potentially crossreact with poison ivy and other Toxicodendrons, and the concepts of systemic contact dermatitis and hyposensitization are reviewed.
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