I did TCA 12.5 percent on my face. I felt mild burning and a little frosting. The scab completely peeled off in 5 days or so, but now I have noticed that the treated area is darker than my skin tone. I have brown skin (Asian Indian). Since I did not burn or frost much, I assume that TCA strength was just fine for my skin and not too strong. So apart from this, what can be the reason for discoloration.