Hyperpigmentation/melasma after Morpheus8 (Photo)

Hello, I had Morpheus8 this year and last session was in March.The doctor mentioned that I can have a trip the next day so I drove for about 6hours.Although I was wearing SPF50 cream,I noticed from that day that my skin got darker and marks in shape of lines started being noticeble. The doctor now tells me that it´s not because of Morpheus,that is melasma and the fact that I was still taking birthcontrol pills. It could be a mix but how can I now treat the dark areas that showed up? Thank you!!