Cause of white dots in renders?

MuzMel

Hey guys. Tonight I tried rendering an indoor scene for the first time. Did the basic 3 point lightning. It looks great to me but the problem is, the wall has random white dots all over it. The figure and it's surroundings don't have it, it is present only in the wall behind him, and the features of the wall such as vent and alarm. I had the firefly filter enabled. Any idea what causes this? 
I wouldn't want to mess with the lightning cause the figure itself looks good.

Also do back lights and rim lights mean the same thing?

Silent Winter

Even with the firefly filter enabled, you still get fireflies in darker areas (iray takes much longer to resolve darker areas than well-lit ones). Solutions include setting the render to go for longer, or rendering larger, using a denoise filter, then scaling down to the size you need.