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Poison Ivy, Oak, and Sumac

Poison ivy, poison oak, and poison sumac are plants that have a sticky oil that can cause an itchy, red rash. The rash often shows up in lines or streaks along with blisters or large raised areas (hives). In some people, it causes serious symptoms such as swelling and widespread, large, oozing blisters.

Home treatment will often relieve mild symptoms. Prescription medicine may be needed for severe reactions.

ByHealthwise Staff
Primary Medical ReviewerWilliam H. Blahd, Jr., MD, FACEP - Emergency Medicine
Specialist Medical ReviewerH. Michael O'Connor, MD - Emergency Medicine
Last RevisedFebruary 19, 2013

WebMD Medical Reference from Healthwise

Last Updated: February 19, 2013
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