Acne forms due to the stoppage of sebum inside pores. Bodily oils and dead skin cells get blocked in pores, therefore impeding the natural flow of sebum to the skin's surface. Acne free skin is achieved by addressing the principal cause of inflammation, not just the symptoms of pimples. When you see the whitehead, it is the final stage of a chain reaction. The time to treat acne is before it ever develops, not once you have the breakout.