A 24-year-old woman presents with the clinical finding shown in the diagram. The structure marked **A** (tender erythematous nodules) on the anterior shins is noted to be painful, initially deep red in color, and shows progressive color changes to yellow and green over the following weeks without ulceration. She reports a sore throat 3 weeks ago. Which of the following best describes the pathological nature of the lesion marked **A**?
A 22-year-old woman presents with painful red nodules on both anterior shins for the past 2 weeks. She reports a sore throat 3 weeks ago that resolved spontaneously. On examination, the lesions marked **A** in the diagram are tender, warm, and erythematous, with color changes from deep red to purple-brown. There is no ulceration or scarring. She is afebrile with normal vitals. Which of the following best describes the pathological process underlying these lesions marked **A**?
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