![]() ![]() They each grow in different parts of the country. Poison ivy, poison oak, and poison sumac are types of American plants. Most people can safely treat the rash at home. When this oil touches your skin, it often causes an itchy, blistering rash. ![]() When urushiol is exposed to air, it turns brown and then black plant leaves develop small black spots.Ī rash from poison ivy, poison oak or poison sumac is caused by an oil found in these plants called urushiol. What's the difference between poison ivy and poison oak rash Poison ivy, poison oak, and poison sumac plants contain a compound called urushiol, which is a light, colorless oil that is found in the fruit, leaves, stem, roots, and sap of the plant.
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