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Grade 1 Acne (light green) - represents patients who developed comedones and few papules. Grade 2 Acne (blue) - represents patients who developed papules and few pustules. Grade 3 Acne (yellow) - represents patients who developed papules, pustules, and few nodules. Grade 4 Acne (dark green) - represents patients who developed pustules, nodules, and few cysts.
