Stretch marks that feel like bruises?

I had my baby on 12/16 via emergency c-section. At the end of my pregnancy I had gone up to 180 pounds from my pre pregnancy weight of 164. Most of it was swelling because of preeclampsia. I am now down to 154 pounds. I was left with these stretch marks that feel like bruises. They are tender to the touch and also sometimes go numb. What could this be?