Face was already clear but started peeling again after applying Cosmelan 2 one week after Cosmelan 1 treatment. Is this normal?

as said above, my face cleared up and looked pretty good around 6-8 days after cosmelan 1 but my dermatologist told me to apply cosmelan 2 one week after the initial treatment (to be applied bedtime only on Tu,Th,Sat,Sun since she prescribed differin to be applied the other days). now my face is peeling again (around the chin & nose/smile lines). will it peel for as long as i use cosmelan 2? also, do i avoid putting cosmelan 2 on the peeling/reddish parts of my skin or is it perfectly safe?