Acne for a few people may be due to allergy. Common allergies are dairy and chocolate. Others may be certain soaps, shampoos, etc. Cut them out and see if blemishes disappear. Then reintroduce one by one to see which product is the cause.
Don't stay out in the sun - it doesn't really clear up pimples. It may only dry skin temporarily but can stimulate oil glands and cause other serious damage to skin.
Pimple: use rubbing alcohol on a wash rag three times a day. It cleans and kills germs at the same time.