Histopathological examination in n onhemorrhagic region showed typical pathologic findings of lichen scle rosus et atrophicus, while in hemorrhagic region showed formatio n of subepidermal blister in which th ere were lots of erythrocytes.

• 组织病理检查:非血疱处皮损符合典型的硬化性萎缩性苔藓的病理改变;血疱处皮损示表皮下大疱形成,疱液中有大量的红细胞。