the best I've found is cetaphil wash and moisturiser, followed by putting benzoyl peroxide 5% over the top of the cetaphil moisturiser. apply the bp just to affected areas, so if you've got forehead acne, apply to whole forehead. apply the bp just at night to start and see how it goes, your skin may be a bit dry and sore at first but persevere.
if you're a girl, the oral contraceptive/ birth control pill can be really helpful, particularly Dianette. visit your GP/ family dr and discuss it.