Skin rendering quality is very dependent on both lighting and skin settings in Carrara. 

There are a couple of ways to work with the skin issue:

1. Select the figure, open the shader/texture and then edit the Shininess setting to something like 4 and the Highlight to  a value of 0 for each domain.

2. Create a "master" shader from one of the skin shaders and then adjust the settings as above. Now you can swap out the other domain instances with a Reference Shader. After that, any change  or adjustment you make to the one shader will affect the whole body. It's a pretty slick way to go.

Mark