La Roche-Posay Effaclar Ultra Concentrated Anti-Imperfections Serum is a concentrated serum of exfoliating acids combined with soothing niacinamide that corrects pimples, blackheads, marks, scars and visible pores. La Roche-Posay Effaclar Ultra Concentrated Anti-Imperfections Serum is a perfect balance between peeling and soothing action as it unclogs pores and corrects persistent imperfections and blemishes day after day. La Roche-Posay Effaclar Ultra Concentrated Anti-Imperfections Serum leaves the skin refined and purified.