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Uriticarial bullous pemphigoid. Histological section shows dermal inflammatory cells, predominantly composed of eosinophils, which line up at the dermoepidermal junction. Notice the spongiosis and exocytosis of eosinophils through the basement membrane into the spinous layer. H&E × 4000. (Courtesy of Dr. Philip LeBoit and the Dermatopathology Service at UCSF).
