Apply this ampoule after cleansing and toning, on thoroughly dry skin. Place a few drops on areas with enlarged pores or imperfections, then gently massage until fully absorbed (you may feel a slight tingling, which is normal due to the spicules). Preferably use it in the evening, 2 to 3 times a week at first, then adjust according to your skin’s tolerance, and don’t forget a good moisturizer (and SPF in the morning).