Gardeners and hikers beware: Poison ivy may look like an unassuming plant, but it's one you're going to want to be able to identify before you wind up with an uncomfortable rash. If you do come home ...

Poison ivy, oak, and sumac contain an oil called urushiol that causes an allergic skin rash. These plants can be identified by their leaf structure, though some non-toxic plants look similar. To avoid ...

Poison ivy, along with poison oak and poison sumac, has an oily coating called urushiol, which often causes redness, swelling, and severe itching within 4 to 48 hours after contact with your skin.