splotchy stuff

I’m getting these splotchy things on the tile in the foreground.
does anybody have any thoughts on this, why this is happening.

http://farm4.static.flickr.com/3104/2350269514\_c571377b06\_b.jpg

In the BG you mean?
How’s the scene lit? what are the settings for GI?

my attempt…
…any vraylightmtl around there with some ultra-high multiplier?