Linea nigra

Has anyone noticed it taking longer to go away after a c-section? I’m hispanic so naturally tanned and always got a pretty dark one with all three babies. After my first which was a vbac it went away within a month or two.. baby number 2 it was still there a after nearly a year and a half! It faded a lot but still visible. My last two were c sections so I’m wondering if this has anything to do with it? Ugh. Does it ever go away? Don’t get why it did the first time and not the second 😥