Azelaic acid %?

[Ravenfaust]

Been using 0.025% tretinoin every evening for a bit now, I tolerate it fine, want to add azelaic acid in the mornings, should I start with 15% or should I be fine starting with 20%? (Obviously I'd slowly build up to daily use). Thank you in advance.

 

[Ravenfaust]

Le bump

 

[Satly]

You should be fine with 20% just slowly incorporate it, I would use it in the morning and tret at night start azelaic twice a week every 2 weeks add a day