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The rash itself is not contagious, and the fluid in the blisters does not spread the rash. Poison ivy dermatitis appears as soon as four hours or as long as 10 days after the exposure, depending on individual sensitivity and the amount exposure. As the rash appears, any sensitivity a person had begins to increase. One starts to react to the slightest traces of a few molecules on the skin. This causes the rash to appear to be spreading, even after treatment has begun.

Poison ivy dermatitis rashes are self-limited; sooner or later they clear up without treatment. Letting nature take its course with mild poison ivy dermatitis is reasonable, but severe rashes need treatment to ease the misery and disability they cause. The very first time this rash is gotten, it lasts longer than a repeat attack, often 3 or 4 weeks.

Source: www.aocd.org

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