Plumping Lip Concentrate. Yves Saint Laurent reveals another ' Top Secret': Yves Saint Laurent Top Secrets Re-Plumping Lip Balm is a targeted lip balm concentrate that leaves lips plumped with moisture, & feeling softer & smoother. Directions for use: Yves Saint Laurent Top Secrets Re-Plumping Lip Balm may be used alone or before makeup application, for even & enhanced makeup results. Apply a thin layer to the lips & lip contour & blend into skin with fingertips. To regain radiant lips that are full of life, delicately massage the lips with the nozzle pen applicator.