If you can't use salicylic acid Benzoyl peroxide 2.5% applied all over the face is the best option. To see results you need to commit to daily application for at least 8 weeks. If this does not work you can try 5% applied every 2 days. To succeed in prevention, you need to stick to the recommended acne prone skin diet and cosmetic routine. This will include restriction of cow's milk and dairy and use of oil-free cosmetics and make-up.