Systemic contact dermatitis--kids and ketchup
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Updated: May 25, 2026

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
Published on: March 24, 2023
Elise M Herro1, Sharon E Jacob
1Division of Dermatology, Rady Children's Hospital and University of California, San Diego, San Diego, California92123, USA. sjacob@contactderm.net
Abstract:
Systemic manifestations of allergic contact dermatitis due to consumption of foods containing balsam of Peru (Myroxylon pereirae)-associated chemicals have recently been reported in children. We present seven children with widespread, recalcitrant dermatitis who experienced 60-80% clearance after initiating a diet low in balsam of Peru, specifically the tomato product ketchup. Furthermore, because we have observed a high prevalence of ketchup in our pediatric patients' diets, we recommend consideration of moderate consumption of this product in patients with recalcitrant widespread dermatitis.
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