Poison oak rash is an allergic reaction to the leaves or stems of the western poison oak plant (Toxicodendron diversilobum). Home remedies and medical treatments can help manage symptoms.

It doesn't matter what part of the poison oak plant you touch. The leaves, stem, and roots all contain urushiol, which is the oil that triggers skin irritation and causes a rash. If you are ...

The plant can grow up to 14 feet tall with 5-foot-wide leaves and 2.5-foot-wide ... This woody shrub is in the sumac family and like poison ivy, poison oak produces an oil called urushiol that ...