A 68-year-old woman with chronic lymphedema of the face following parotid surgery presents with a 24-hour history of rapidly progressive facial erythema, fever (39.1°C), and rigors. On examination, she has a brightly erythematous plaque involving the left malar area with a distinctive **sharply demarcated raised border** (marked **A** in the diagram) that is warm, indurated, and tender. There is peau d'orange appearance with dimpling around hair follicles. WBC is 18,400 with left shift. Which of the following best describes the pathophysiology underlying the sharp, well-demarcated appearance of the lesion marked **A**?
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