I've been researching extensively in preparation for doing my own TCA chemical peel and found this addressed somewhere on one of the clinic's online aftercare instructions (although I can't seem to find the clinis website I found it on). They suggested that some individuals could end up with pigmented areas and that occasionally, further treatments to these areas can help to correct it.
You could try treating only the scarred area again as you suggested you might try, but... gently! I would only do 2 layers 3-5 mins apart and leave only for the recommended time. It's better to go slowly and gradually try to fade the pigmentation. You don't want to risk causing more damage. If the pigmentation is still there in a few weeks, you could consider repeating the peel again.
Hope this helps and good luck!
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