holy grail

Hi guys! I just want to share with you my holy grail serum. This is the anua azelaic acid + hyaluron. I had mild to moderate cystic acne and my derma prescribed me Epiduo and it helped clear my active pimples but I was really bothered with my hyperpigmentation and dark marks. But then I tried this product and it really helped with my PIE (post inflammatory erythema) in about 4-6 weeks my hyperpigmentation really improved without irritating my skin.