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a Monocellular infiltrates are observed in the papillary and reticular dermis, associated with subepidermal multicenter blisters. HE. ×10. b Subepidermal blister without inflammatory infiltrate. HE. ×40. c CD117-positive infiltrate, dermis cells (×20). d Subepidermal blister associated with CD117-positive mast cells (×40). 106 × 127 mm (300 × 300 DPI).
