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(A) Diffuse dermal infiltration composed of lympho histiocytes and abundant neutrophils with necrosis of dermal collagen fibers and focal aggregation of numerous acid-fast bacilli identified by Ziehl-Neelsen stain (inset) in case 1 (H&E stain, ×100, Inset: Ziehl-Neelsen stain, ×400). (B, C) Deep dermal abscess with inflammatory cellular infiltration and foreign body reaction in case 2 and case 3, respectively (H&E stain, ×100).
