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Botanical Briefs: Toxicodendron Dermatitis.

Toxicodendron dermatitis is a type IV hypersensitivity reaction resulting from exposure to urushiol found in poison ivy, poison oak, and poison sumac. The dermatitis presents as a pruritic erythematous rash with vesicles and bullae in areas that were in contact with the plant. Symptoms present after 24 to 48 hours and can be managed with a variety of treatments, depending on severity. Avoidance is the principal way to prevent Toxicodendron dermatitis, highlighting the importance of educating patients on identification of plants.