Large erosive annular erythematous plaques on the back. (b) Histology of the skin shows subcorneal acantholysis and blister filled with neutrophils. The epidermis is infiltrated by a large number of neutrophils. H and E stain ×100 magnification. (c) Direct immunofluorescent staining shows intercellular IgG in the epidermis in a chicken wire-like pattern. IMF stain ×200 magnification.
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