Histopathologically, intraepidermal acantholysis is located at the granular layer in PF and suprabasally in PV.

病理上，落叶性天疱疮的表层内棘层松解位于颗粒细胞层里，而寻常性天疱疮则位在基底层之上。

Histopathologic examination showed hyperkeratosis of epidermis, increased thickness of the granular layer and dilation of subpapillary vessels filled with red blood cells.

组织病理学检查示表皮角化过度,呈乳头瘤样增生,颗粒层增厚,真皮乳头见大量增生扩张的毛细血管,管腔内含红细胞,血管周围淋巴细胞浸润。