Blotches

[GTex62]

Windows 10 Pro
Keyshot 8.1
zBrush 2018
64GB RAM

I've changed the environment, turned on and off lights, changed roughness of materials, increased samples, re-booted.  All to no avail.  The region render does not show these blotches.  I can turn off all scene items except the ground plane and it still renders the blotches.  As a final try I changed to Interior and they went away.  Product lighting seems to be the problem.  Are these fireflies?

[RRIS]

Those are low-sample caustics if I'm not mistaken.. have you got that switched on?

[GTex62]

When I switched to Interior it turned off Caustics and they went away...
Thank you for the reply.