After Fraxel laser CO2, there are some dark spots that were caused by the laser that won't disappear. What can I do? (Photo)

I wanted to lighten some freckles and pigmentation on top my lip caused by coloring my mustache hairs blond 1 year ago. When the doc passed the laser on my face she said had to go deep on some of the freckles & top of lip as the were darker.It felt like she burned me deep on those parts. After 8 days the old dead skin fell off without problems but now its after 1month post &the parts she went deep look like there are there to stay. I went to the doc and all she keeps saying that it will go away