Identifying Poison Ivy and Other Poison Plants Touching these rashes or their drainage won't cause them to spread. The rashes don't usually develop until 12 to 72 hours after contact, and can develop at different rates. These symptoms typically last 1 to 3 weeks, and don't spread unless the urishiol comes into contact with other parts of your body.
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Red rash: can be bumpy, can develop in streaks or patches where skin has come into contact with the oil.Red, itchy skin: usually as an early sign.The severity of the rash depends on person and can change over time.
Many people don't get a rash the first time they come into contact with urishiol, as sensitization occurs. Contrary to belief, the rash it causes can't be spread person-to-person, but you can get it from the oil if it's stuck to clothes, pets, gardening tools, or anything else that's come into contact with these plants. Around 85 percent of people develop a rash after coming into contact with urishiol. The substance that causes a reaction from exposure to all three of these plants is a toxic oil called urushiol, found in their sap. The Facts About Poison Ivy and Other "Poison" Plants This results in the itchy, painful rashes we associate with these plants. The "poison" in these names is a bit misleading, as they don't poison, but cause a form of allergic contact dermatitis. You've probably been warned about poison ivy, as well as similar plants like poison oak and poison sumac, if you've ever been camping or hiking.
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