Strange issue on outside one one side and only vertically

[TTVert]

Never seen this before. Using PLA. I have been experimenting some lately w/ increasing the speed and layer height. Also using a different filament. I recently went from my normal .22mm to .28 and also from 50mm/s for print speed, 45mm/sec for outside perimeter and 50mm/sec for infill to 60/60/100 mm/sec. I cannot see it being perimeter speed given the rest of it is perfect. Given it's only in one spot makes me feel something is weird w/ the printer all the sudden just when the printhead is right at that location, not so much print speed/filament Is there a name for this imperfection so perhaps I can do a bit more research on my own also?

Dave