Struggling with dots on prints

[clydie]

Hi All, I am struggling with getting dots on my prints. I use Ultimaker Cura as my slicing software and most settings are the standard defaults. My prints has dots on them at the back. I am attaching a pic of a yorkie I printed. I decided to print the infamous xyz cube, and yes they are very obvious in this print, attached is the view of the front of the cube as well as the back. I am using a ender 3 v2 printer. Any suggestions would be greatly appreciated. What have I done: Upgraded the springs to remove bit of movement that was on the build plate. Spent hours on bed levelling.Any other suggestions. Thanks in advanceClydie