Peeling like hell after adding azelaic acid

Anyone knows what's going on? I've been on Tazarotene 0.1% for 7 weeks now. Daily use. I added Azelaic Acid 15% last night along with the Taz and today i'm peeling like hell. My routine is AM: vanicream, sunscreen. PM: cetaphil cleanser, Taz 0.1%, vanicream