近来扇平苔癣的研究倾向于集中在病损表皮的变化,而显微镜所见到的以淋巴细胞和巨噬细胞为主的单核细胞的浸润很少受到注意。近年来已经确定淋巴细胞可区分为不同功能和不同来源的两种类型。第一组,来自胸腺的(T)淋巴细胞,它主要参与细胞免疫反应,例如皮肤迟发型超敏反应或移植物排斥反应,以及在体液反应中协同作用。第二组淋巴细胞亚群体,B(腔上囊等器官)淋巴 Recent studies of flat lichen planus tend to focus on changes in the lesion epidermis, and infiltration of lymphocytes and macrophage-dominated monocytes seen by microscopy is seldom noticed. In recent years it has been established that lymphocytes can be distinguished into two types of different functions and of different origins. The first group is (T) lymphocytes from the thymus that are predominantly involved in cellular immune responses such as delayed-type hypersensitivity or graft rejection and synergism in humoral responses. The second group of lymphocyte subsets, B (supracapsular sac and other organs) lymph