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If you're combining azelaic acid with tretinoin, then you're gonna go from thinnest to thickest. So if your azelaic acid is a serum, like the newest serum, then you're gonna apply that first and then tretinoin and then a moisturizer. If your azelaic acid is a cream, then generally it doesn't matter which one you apply first, but I typically will do tretinoin first and then azelaic acid followed by a moisturizer. Let me know in the comments if you're using both tretinoin and azelaic acid.