Post inflammatory hyperpigmentation 2 years after filler injection, can/will this ever go away completely? (photo)

I had tear through fillers to reduce appearance of malar bags january 2016, but they only made them bigger. Had 1 treatment of hyaluronidase in April 2016 to reverse it. Had the discolouration ever since the first round of injections. Derm said it's PIH and I've used hydroquinone for 3 months and no improvement. It's a very mild hyperpigmentation, but I think it's dermal. It's only under 1 eye, the left eye resolved. Can it be completely removed, or am I left with this dark circle for life?