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Hematoxylin-eosin staining (A) and direct immunofluorescence on salt-split perilesional skin biopsy (B), both 100×-hematoxylin-eosin. Microscopic examination found subepidermal blister formation with numerous eosinophils in the blister cavity and a superficial dermal infiltrate consisting primarily of eosinophils. Periodic acid–Schiff stain was negative. Direct immunofluorescence studies on salt-split showed 2+ linear staining of IgG at the dermoepidermal junction.
