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The raised, red, itchy bumps that are a telltale sign of exposure to a poisonous plant don't always show up right away, says emergency medicine specialist Dr. Leigh Vinocur. To learn why, and how you can prevent rashes from poison ivy, oak or sumac, watch this video.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.