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acne vulgaris OR "comedones," open
- Blackheads, or open comedones, are common in acne. Clogged hair follicles reflect light irregularly to produce this black hue.
- Blackheads, or open comedones, are common in acne. Clogged hair follicles reflect light irregularly to produce this black hue.
- ... 6 millimeter wide erythematous (red) pustules with large open and closed comedones. Permanent scarring may follow a severe case of acne. Men are more often affected on their shoulders ...