I started using prescription tretinoin (Retin-A) at night for acne and hopefully anti-aging effects. I read that it is acceptable to use a moisturizer after applying the Retin-A, but I was wondering about face oils. Would it be counter-productive for me to use a face oil such as olive-derived squalane (instead of a cream moisturizer)? Or is this okay? Thank you very much for your time and any help you can provide!