Figure. 2. Histopathological findings
(a) Histopathological findings of the erythema and bullae (hematoxylin-eosin stain, ×40). Subepidermal blistering accompanied by eosinophilic infiltration is evident. (b) Findings of direct immunofluorescent assay (×200). Immunoglobulin G is deposited in the basement membrane zone. (c) Immunohistochemical analysis in the active lesion using anti-FoxP3 antibody (Thermo Fisher Scientific, Rockford, IL). A few positive cells are shown (×400). (d) Immunohistochemical analysis in the inactive lesion using anti-FoxP3 antibody. Several positive cells are shown (×400). (e) Immunohistochemical analysis in the intact skin using anti-FoxP3 antibody. Few positive cells are shown (×400).