![]() ![]() Reactions to poison ivy range from mild to severe. If you have a rash, you shouldn't scratch it, Desai said. "Sometimes it will be in a line, because the plant brushed by it in that pattern," he said. "Usually you'll see at the site of contact with the plant," Desai told Live Science. Seemal Desai, a dermatologist and medical director at Innovative Dermatology in Plano, Texas. The inflammation of the skin is due to the body's immune reaction to the plant oil, said Dr. ![]() The rash is not contagious, but the oils can remain on clothing, shoes and other objects for a long time if not cleaned, and can cause rashes in the future, according to the NIH. Skin contact with poison ivy's oils causes a red, streaky and patchy rash, extreme itching and red bumps that can form blisters. (Image credit: New York Department of Transportation.) Physical effects Using a chain saw to cut down such a tree produces flying poisonous sawdust. All parts of the vine contain urushiol, including the hairs. The "hairs" allow the vine to grab onto the bark and grow up to the tops of even tall trees. As indicated by the watch, the vine can easily grow to the size of a man's wrist. This coarse, hairy growth on the trunk of a tree is a mature poison ivy vine. ![]()
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