This is not my first T.C.A peel- I have built up from 12% to 15% 18% and 21% percent before I did the 24%. This seems much deeper than the other peels- and it could be that I tried 2 layers and it frosted much more than before. I'm scared - I plan on staying inside until the 30th of November and being incredibly cautious after that. I just want to know - is this normal? What should I do? I don't want a huge permanent brown spot in the middle of my cheek. How long should I expect this to last?