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A skin biopsy of the subcutaneous nodules. (a) A skin biopsy of the subcutaneous nodules showing scattered non-caseating epithelioid granulomas (Hematoxylin and Eosin staining). Additional immunohistochemistry of the granuloma content using a specific monoclonal antibody against Propionibacterium acnes, lipoteichoic acid (PAB antibody), showing positive staining (b); however, no Tuberculous bacilli-associated staining is evident (c).
