Without actually seeing you, it is difficult to determine the extent of injury to the skin. If hyperpigmentation (skin that is darker than your normal skin) is present, 2-3 weeks after your peel, consider applying hydroquinone with moisturizer in the morning, and tretinoin cream (retin-a) with moisturizer in the evening. If you are still in the healing phase following the peel, I would apply a thin layer of aquaphor healing ointment (available over-the-counter) daily.
For a light chemical peel, it would be extremely unusual for permanent whitening of the skin to occur. Any darker pigmentation that you have should gradually correct, but will take time (sometimes up to 1 year). A board certified dermatologist or plastic surgeon should be able to differentiate between pigmentation changes and actual scarring that is developing. If you have the latter, you would probably benefit from treatments with a laser e.g. pulsed-dye laser.
Good luck.
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