4.Azelaic acid

Azelaic acid is a naturally occurring acid found in grains such as barley, wheat, oat and rye.
It has antimicrobial and anti-inflammatory properties, which make it effective in the treatment of skin conditions like acne and rosacea. The acid can prevent future outbreaks and clean bacteria from your pores that causes acne. It is known to inhibit the enzyme tyrosinase, which is needed for the production of melanin.You can apply it twice a day all over your face.follow it with your sunscreen and you are ready to go.