Can this be linea nigra? Out of the blue? How can I remove it? (photos)

I had a tummy tuck 3 years ago. Part of it was botched and I had 3 surgeries to correct it 2 years ago. All of a sudden, it appears as if linea negra has come back! This line popped up about 2 or 3 months ago out of the blue. I have no idea how or why. No major changes in lifestyle. Any ideas what it could be and how to remove it? Thank you!