How to reverse pigment loss after laser?

I have had laser treatments on different areas of my face, i.e: not the entire area but random areas on my cheeks. I think it was from a q-switch laser which she was using to treat redness. I think the nurse didn't know what she was doing. I now have pigment looss on these areas she treated and my face looks different colors. I am not sure if it is this or vitiligo but my questions is what should I do? How can this be treated/corrected? Would consistent sunscreen use fix it?

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