![]() Allergic contact dermatitis is most often confined to a specific area and usually has clearly defined boundaries. Thankfully, scratching the rash won't usually spread the urushiol poison to other parts of the body. Urushiol resin can be transferred by fingers or animal fur, and it can remain for months on clothing, shoes, and tools. But once someone is sensitized and fully allergic, their next contact with poison ivy could cause itching and a bad rash within 4 to 48 hours. This is because the body is registering its new sensitivity, a process that can take up to 10 days. With an allergic reaction such as the one poison ivy causes, even repeated exposure to the plant may not cause a rash at first. Foreign substances can cause inflammation in 2 ways: irritation ( irritant contact dermatitis) or allergic reaction ( allergic contact dermatitis). Doctors call this reaction contact dermatitis, which simply means an inflammation caused by contact with a foreign substance. It's so toxic that tiny amounts on exposed skin can trigger an inflammatory allergic reaction. ![]() The leaves, stems, and roots of poison ivy contain a resin called urushiol.
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