Skin contact with the oil of a poison sumac plant leads to an itchy, burning, allergic skin reaction. You can’t contract the rash from another person, but the plant’s oil can transfer from ...

Poison ivy, poison oak, and sumac rashes usually clear up by themselves within a few weeks. If someone believes that they have had exposure to urushiol, they can remove the oils immediately by ...

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.