Strange iray blotches

Hey all.
There might be a simple solution to this, but my tiny brain can't figure it out. I'm looking at doing some really simple almost "cartoony" characters, who have skin textures that are just flat colours. Problem is, when using a texture that is just all one colour, I'm getting these strange blotches as seen here:
As far as I can tell, it's only with certain darker colours, but not all.
Has anyone ever seen this before, and any idea what causes it?
Thanks,
Cheet.
Comments
Finally found it.
It was due to the texture compression in the advanced settings. Didn't even see the other tab up there lol.