Immunohistochemistry and immunofluorescent staining of Cx43. (a, b) In control healthy skin, immunosignals of anti‐Cx43 were expressed in the intracellular junctions of keratinocytes in the stratum corneum and granular layer (×100, DAB stain, ×200). (c) In lesion of patient 1, immunosignals of anti‐Cx43 were strongly expressed in the stratum corneum, granular layer and spinous layer, whereas basal layer show low expression of Cx43 (×100, DAB stain). (d) Cx43 protein was mainly expressed in the cytomembrane and cytoplasm (×200). (e) In lesion of patient 2, immunosignals of anti‐Cx43 were strongly expressed in the stratum corneum and granular layer (×100, DAB stain). (f) Cx43 protein was mainly expressed in the cytomembrane and cytoplasm (×200)