Odd screen pixels

[Wetstuff 0]

I use a gaming monitor with a Dahua NVR, PoE switch to Dahua cam connected to ~100m of cat6.  I used to think - after a rain, there was residue on the exterior ball of the camera...  then I thought perhaps, the interior somehow got affected by humidity.  After cleaning everything, was a bit more clear but with lots of odd pixel formations if standing <1m from the monitor.  It reminds me of a very clean car with a terrible paint job.  Here is a tight closeup of the screen.  Perhaps you have seen this before and can point me to the likely issue saving me from a further wild goose chase?  Thanks.  Jim