Dealing with poison ivy, oak, or sumac exposure can be uncomfortable and frustrating. These plants contain urushiol oil, ...

Understanding Poison Ivy Oil and Its Effects Poison ivy, poison oak, and poison sumac all produce urushiol, a sticky, l ...

Q: We discovered poison ivy in our woods. If our cats and dogs touch it, can it cause them problems? What if they rub up ...

and poison sumac are three of the most common causes of allergic contact dermatitis in the U.S. They all contain an oil called urushiol, which triggers an allergic reaction, usually an itchy rash.