That looks like the seam and you've told the slicer to align the layer start/stop points. It also looks like you've got a bit of over extrusion happening, at least at those start/stop points, and I can't tell from the photo if the rest of the print suffers the same. Have you ever calibrated the extruder? Use this procedure and pay attention to the "e-steps fine adjustment" procedure.
I started with this:
and stopped adjusting when I got to this:
I ended up at retraction acceleration = 3000 mm/sec^2 and retraction speed = 30 mm/sec.
Ultra MegaMax Dominator 3D printer: [
drmrehorst.blogspot.com]