A 28-year-old woman presents with asymptomatic firm ring-shaped lesions on the dorsal aspect of her hands and feet. The lesions are flesh-colored to violaceous, arranged in an annular pattern, and notably lack surface scaling. On dermoscopy and clinical examination, the structure marked **A** in the diagram shows the characteristic appearance of granuloma annulare. Which of the following histopathological findings would BEST differentiate this condition from necrobiosis lipoidica diabeticorum?
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