TCA- 30% Questions! - Atlanta, GA

I am african american and decided to use a 30% TCA...

I am african american and decided to use a 30% TCA on my hyperpigmentation marks only. I have used 15-25% before and it had not burned my skin! However I used the 30 % last night and it frosted QUICKLY. it turned extremely white, about 15 minutes later it turned extremely dark and has been the same since! should I expect scarring?? help! how can I reverse the burn?
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