Should I apply cosmelan 2 on peeling skin? or do i have to wait for it to stop peeling before applying again?

i first got the cosmelan 1 treatment with my dermatologist; the peeling stopped after a week and my skin looked pretty good. however, she prescribed me to use c2 1 week after the initial treatment so now, my skin is peeling again. she told me to use it every other night (tues, thurs, sat, sun) but im wary of applying it on the pink-ish/sunburnt-looking peeling parts of my face. is it safe? or can i just wait for the peeling to stop before apply again? or maybe just avoid putting on those areas?