All parts of the plant, including roots, can cause an allergic reaction year-round, according to the American Academy of Dermatology. Poison oak is commonly confused with poison ivy, but the two ...
The most common causes of ACD are the plants of the Rhus genus, poison ivy (toxicodendron radican), poison oak (toxicodendron quercifolium and toxicodendron diversilobum), and poison sumac ...