You are unlikely to completely avoid getting pimples, since they are mostly caused by hormones. But when I was a teenager, I used Neutrogena Acne Wash for my face and back and it was very helpful to get rid of them faster and keep them smaller. Using Witch Hazel as a toner was helpful for me, too. Try not to scrub too much and only wash your face once or twice a day so that you don't irritate your skin. As an adult, when I get pimples, I put some Drying Cream on them at night from a brand called Mario Badescu. You can buy Mario Badescu products on their web site, or at stores like Sephora or Ulta. They are a little expensive, but you only use a little, so it lasts a long time.