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 ...
For example, poison ivy (Rhus toxicodendron) is a prominent and historic homeopathic remedy for certain kinds of joint pain associated with what might be called today fibromyositis or fibromyalgia.