Is this melasma or PIH? (Photo)

From the photograph you sent and your description of the treatment you received this would appear to be PIH as the result of your skin increasing melanin production in an effort to protect itself from 'injury'.
If it does not fade naturally then PIH treatment is usually a 3 step approach comprising a daily sunscreen, regular exfoliation (peels, AHA etc.) and melanin suppressants (hydroquinone, retinoids, Vit C etc.)  A dermatologist will be able to advise you further if required.

Thank you for your question. From your photo, it appears you PIH from the trauma your skin incurred from your various procedures. This will fade gradually over time. Please remember to protect your skin from the sun and use skincare products to promote healing. I recommend following up with your treating physician for proper diagnosis and treatment. Best of Luck!

Thank you for your inquiry.  You have PIH which results from the trauma that your skin incurred from the various procedures. This will gradually fade with time, given that you are protecting the skin from the sun and using skincare products to promote healing.