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I suggest you speak with your doctor about trying a prescription retinoid. This vitamin A-derivative has been shown to be successful at increasing the rate of skin cell exfoliation, allowing dead skin to slough off more regularly and preventing acne and blackheads. While benzoyl peroxide and clindamycin (the two main ingredients in Duac) are both effective in fighting acne, they mainly act to fight the bacteria that causes acne. In your case, it seems that the problem is exfoliation-related. In the meantime, if your skin is not sensitive, try an over-the-counter AHA mask just on your nose.