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People should avoid scratching the rash as bacteria from their nails may lead to infection.
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#POISON OAK RASH VS POISON IVY HOW TO#
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The rash appears where the oil has come into contact with the skin. The immune system learns to recognize the oil from the first contact and then reacts to it aggressively on future contact. People who are allergic to the oil do not have a reaction until they come into contact with it for a second time. People can develop an allergy to the oil, leading to a rash referred to as allergic contact dermatitis.