A 45-year-old man from rural Maharashtra presents with multiple symmetric ill-defined hypopigmented macules and nodules over his face, trunk, and extremities for 2 years. Slit-skin smear shows acid-fast bacilli. Skin biopsy is performed. Histopathology reveals the dermis filled with foamy macrophages containing dense clumps of acid-fast bacilli, with a characteristic spared subepidermal strip (marked C in the diagram). Which of the following best explains the pathologic significance of the structure marked C in lepromatous leprosy?

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