Why is my incision line black? (Photo)

Hello, I'm three weeks post touch up lipo. I noticed that my incision lines are black, the dr didn't used any stitches to close the sutures. When they healed I had a scab and took good care of it. Is this black line going to fade? Im not using any lotion or oils on my skin. I did not have this problem with my first incisions on my first lipo five months ago. My next follow up is in three months.