How do I remove this hemosiderin stain deposit that was left after a terrible tear trough filler gone wrong? (Photo)

My injector has used Juviderm Vollure and her technique was horrible. Unfortunately after horrible bruising, and swelling I was left with a very bad side effect of hemodeserin staining due to the fact that she hit blood vessels during the treatment. She used a cannula and the cannula also scarred my skin. What can I do? Any recommendations ?