Skinoren / Azelaic Acid 20%

[Admistrative]

Got some scars with slight pigment and PIE, how should i introduce this just got it prescribed? im on 5mg accutane and my dermatologist told me to do epiduo on the red marks cause adapalene speeds up cell turnover, would be better for me to change from the Epiduo 3mg to Azelaic acid 20%?
Just bought it and idk how to introduce it on my routine, i just do 5mg accutane daily cause its summer, spf-50 and 315 relief cream as mosturizer thats it and i splash water on my face in the morning sometimes