I have used the TCA 20% alot but it has never frosted until this last time. I started using obagi c and retin A . My skin has been looking amazing and I thought I will do a peel for these horrible fine lines on my face. I could usually stand this for 5min. but less than a minute I was antsy and washing it off. I did notice frosting only on my lines and a few other spots before washing my face. I usually use Mary Kay Time Wise Replenish. My face looks much better! Thank you, have a lovely day!