A 28-year-old woman presents with a 10-day history of bilateral, tender, warm nodules on her anterior shins. On examination, the lesions are ill-defined, erythematous, 2-3 cm in diameter, and show color changes from red to violaceous. The structure marked **A** in the diagram represents these characteristic lesions. Which of the following BEST describes the histopathological basis of the lesions marked **A**?
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