Have also tried this when my pimples started to dry up after using their blemish masque. The particles are fine and as advised by the sales, I left it on for a while after slightly scrubbing. The first time I used it, it tingled a little bit, but after washing, the face was obviously fairer and smooth. By now, the scars are all clear and I'm using it once or twice a week to clear the pores and avoid blockage. Really good stuff!