Sothys Dermabooster Purifying Serum 20ml this serum works effectively on oily skin, appearance of spots is reduced, the skin texture is improved and pores refined. Skin is left smooth and clear. apply morning and evening, gently tapping onto blemishes. For general use: apply to the entire face. Follow with the appropriate cream. Directions for use: remove the pipette from the bottle, press the pipette and keep it pressed while dipping the pipette into the bottle. Release the pressure to dispense the product in the pipette.