The lesions are most commonly found on exposed areas of the skin, which come in contact with the ... on the scalp and ears while poison ivy, poison oak, and poison sumac usually produce lesions ...

P oison sumac is a poisonous plant similar to poison ivy and poison oak. Each of these plants contains an oil called urushiol ...

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 ...