AHA, BHA serum vs Azelaic acid cream Vs Retinol serum which works wonderfully in a 35 years old corporate working men who came to me with uneven skin texture and tone in his face and neck comparatively his body which has 2-3 shades of lighter complexion to it , think like a board certified Dermatologist and as a practicing dermatologist which one should I recommend to him which will show drastically visible result with in few weeks?