I have two hypopigmented scars on my forehead. One was from stitches about 30 years ago (the horizontal one which is more lateral). The scar is flat appearing. I have tried microneedling through a professional which created an inflammatory response but didn't add any pigment. The other one is vertical, flat and midline. I actually have no idea how I got this one. I have also tried microneedling with no improvement. What is a good option?