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Histology. A, Biopsy of left upper back shows vacuolar interface dermatitis with focal full thickness epidermal necrosis and mild superficial perivascular lymphocytic infiltrate and dermal edema. B, Detail shows vacuolar interface and focal full thickness epidermal necrosis. A and B, Hematoxylin-eosin stain; original magnifications: A, ×40; B, ×200.)
