If this treatment is still recent, wait, use sunscreeen, and hopefully you can get some of the pigment back.
If this is an old treatment, dealing with hypopigmention following chemical peel (or laser) could be difficult to treat. After the initial healing phase, a board certified plastic surgeon or dermatologist comfortable with IPL, lasers, and peels might suggest a very conservative treatment to try to even out the discoloration.
In extreme cases camouflage therapy (makeup) might be the only treatment. Best of luck!

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