I'm 27 old and I have childhood scars and dark spots on my face. Combination skin more of the dry side if I to use retin A . Can I use it with regular moisturizer like Olay night cream or a Bioderma moisturizer? I live in a hot, humid and dusty area (Middle East). I don't leave the house that much but I use the AC a lot in here so It could be drying.