Papulopustular Rosacea

A 45-year-old woman of Celtic origin presents with a 3-year history of recurrent facial flushing triggered by spicy foods, hot beverages, and alcohol. Over the past 6 months, she has developed persistent central facial redness with crops of inflammatory papules and pustules on her cheeks, nose, and chin. Notably, she denies any comedones. On examination, the structure marked **B** shows central facial erythema with scattered small dome-shaped erythematous papules (2–4 mm) and occasional pustules on the convexities, with visible telangiectasias. There are no comedones, nodules, or cysts. Which of the following best describes the diagnostic significance of the findings at **B** in distinguishing this condition from acne vulgaris?