Hi. Greetings. Use a good sunscreen. Please discuss the same with your dermatologist. Because he'll be the best person to judge why u have this, since he knows which Peel he used and how long he used it for. Also don't expect the pigmentation to go away all at once with one Peel session. You'll need repeated peels over five to six sessions over few months. Hope this helps. Warm regards Dr Govind Suresh Mittal.