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A, Extensive epithelial erosion with neutrophilic and lichenoid infiltrate in the superficial corium obscuring the dermoepidermal junction. B, Effacement of the epithelium with superficial lichenoid infiltrate and neutrophilic exudate at the edge of the erosion as well as small foci of hydropic degeneration with rete ridges elongation. (A and B, Hematoxylin-eosin stain; original magnifications: A, ×4; B, ×20.)
