Hello,
Epidermal hyperpigmentation tends to be short lived and/or easily corrected with the medications you are using. The fact that the improvement is minimal hints that the problem may be deeper. Hopefully you are getting professional help with this to help focus your erfforts.
Our treatments use combination therapy to improve the epidermis and dermis. We see atrophic and hypertrophic scars, as well as scars that have hypo and hyperpigmentation. Our main concern is rebuilding collagen and that is why we use a HIDEF protocol that includes combination therapy. Morpheus...
I usually advise my patients not to pick at their skin following a chemical peel but rather replace that compulsion with frequent application of bland moisturizers (e.g. aveeno, cetaphil, cerave). You otherwise place yourself at increased risk of scarring.