图示接触性皮炎,由致敏淋巴细胞引起的IV型超敏反应,在接触致敏性物质几天后出现。如毒橡树和毒叶藤之类的抗原常引起.
This is contact dermatitis, a form of type IV hypersensitivity in which pre-sensitized lymphocytes led to this inflammatory reaction a couple of days after contact with the offending plant material. Antigens such as those in poison oak and poison ivy are most often responsible for this appearance.
