What it is: A pore-refining complexion enhancer and makeup primer for combination skin prone to imperfections. What it does: This targeted skincare product instantly reduces the look of enlarged pores and mattifies shine, making skin appear visibly smoother. Skin quality is improved and ready for a flawless makeup application. What else you need to know: The three benefits to YSL's Pore Refiner are: -Pore minimizing effect: Enriched with salicylic acid, this skincare formula eliminates dead cells that dull the complexion, to refine skin's texture and visibly tighten enlarged pores. The result is a perfectly even complexion.