Really hard to say if this is PIH, melasma or a combination of both. A Board certified dermatologist who performed this can shed light as to the diagnosis. As for treatments, certainly HQ creams can help, I would also add some gentle regular laser sessions- like Clear and Brilliant or even low dose QSL. All the best, Dr Davin Lim, Brisbane. Australia.
I suggest seeing a cosmetic dermatologist with experience in treating darker skin types. You can do a combination of skin care, lasers, and peels. Best, Dr. Emer.