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    GlossaryPoison Oak

    plant causing itchy rash via urushiol-induced contact dermatitis

    Poison Oak is a plant that contains an oily resin called urushiol, which can cause an allergic skin reaction known as contact dermatitis. When people come into contact with the leaves, stems, or roots of the plant, they may develop an itchy, red rash with blisters. This reaction is similar to that caused by poison ivy and poison sumac, and it can be severe in sensitive individuals.

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