I had a c-section 2 weeks ago. During pregnancy there appeared a dark line starting from my navel down. Now it’s still there, looking even darker. I do care of my skin, but when it is supposed to disappear? Any advice how I can help it go off?

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I am NOT going to do this. Im just curious!!
So please dont say stuff like “this is not a nice joke.” and all that.
I heard that you can draw another line on a pregnancy test to make it look like its positive. But im just wondering. What would u use to draw the line? How would you get it perfectly straight and not get pen or whatever on the sides on the little window thing?