A GREAT way to avoid acne/pimples is to wash your face often, about 5 times a day. Also this is very very very important: DRINK A LOT OF WATER. TRUST ME!!!!
It will help. I am a 13 year old girl who gets pimples only if I DON'T drink water. But if about 6 or 7 glasses of water each day, it really works. There is nothing on my face.