Bullous pemphigoid ( BP) is an autoimmune subepidermal blistering skin desease, considered to be a Th2 - dominant diseas大疱性类天疱疮(bullous pemphigoid,BP)是一种自身免疫性表皮下大疱病,有学者认为是Th2占优势的疾病,患者皮损中存在IL-4、IL-5、IL-13等Th2型细胞因子。