Poison Ivy/Oak/Sumac (Allergic Reaction to Urushiol)
Poison Ivy/Oak/Sumac Contact with plant oil triggers rash A sure sign of spring and summer are the skin rashes caused by exposure to poison ivy, oak, and sumac. These three native American weeds are a common cause of allergic reactions in millions of people each year. Contact with the urushiol—an oily, toxic, irritating chemical found …