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Poisons oak, ivy and sumac all contain an oily chemical known as urushiol, which irritates your skin and can produce a severe allergic reaction. While up to 30 percent of people are immune to these urushiol-induced allergies, those of us who are not so lucky can experience serious discomfort when we come in contact with this plant --including itching, redness, oozing skin and severe burning pain where the plant touched your skin.
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