I got shocking pigmentation marks when I was pg with Arabella and after I had her they just didn't seem to be going away, not even fading in the slightest and got worse when I had some sun even though I always wear sunscreen.
I ended up trying a product from Clinique called Even Better Skin Tone Corrector and it worked a treat. I noticed the marks disappearing after a couple of weeks. Cant really remeber how much it was, maybe about $50 or $60, but so worth it and it lasts for ages, I still have the first bottle I got. I also use the foundation with skin tone corrector in it too, awsome stuff... Can you tell I like Clinique products LOL...