[Routine help] Ordered The Ordinary Vitamin C and Azelaic Acid, thoughts and how to incorporate them properly?

Beauty Tips For Body Care
Hi everyone!So I just picked up some of The Ordinary line, the Vitamin C Suspension 23% and Azelaic Acid to deal with some stubborn PIH & PIE.I have dry/acne prone skin, the acne is pretty much under control with the use of Adapalene .3% and Aczone. I've been using both prescriptions regularly for ~6 weeks and my skin has adjusted well. However, I have a lot of red marks leftover which I'm looking to treat.My current routine: Wash with Neutrogena Ultra Gentle Hydrating CleanserAczoneCerave AMPM:Garnier Micellar WaterWash with Neutrogena Ultra Hydrating Cleanser (wait ~15 min)Adapalene buffered with Cerave lotionHow do I best incorporate the new products to minimize irritation? Is it safe to use the azelaic acid and retinoid in the same night, or should I alternate them?Thanks!
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