Poison ivy (Toxicodendron radicans) is a vine that contains an oily resin known as urushiol. According to the Centers for ...

There are many outdoor adventurers who are familiar with the itchy, irritating reaction that results from an encounter with ...

Like poison ivy and poison sumac ... medical help if you experience symptoms of anaphylaxis or a severe allergic reaction.

Poison ivy, poison oak, and sumac grow in wooded and marshy areas. Their sap contains an allergen called urushiol. Urushiol can trigger an allergic skin reaction or contact dermatitis. About 50% ...