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How does the rash from poison ivy, oak, and sumac happen?

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When your skin is first exposed to urushiol, it tells your immune system that the irritating chemical is there. Your immune system then prepares a defensive reaction for the next time the skin comes in contact with it. This sensitizes the skin so that new contact with urushiol causes an allergic reaction.

SOURCE: 

American Academy of Dermatology.

Reviewed by Nayana Ambardekar on July 07, 2018

SOURCE: 

American Academy of Dermatology.

Reviewed by Nayana Ambardekar on July 07, 2018

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Where in the United States is there poison ivy, oak, and sumac?

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