I already put the specular down to 0.004 (lowest the slider went besides 0). I put it at 0.001 but that made no difference. Roughness at 0, also makes no difference.
Setting the bump map at 0 (power) does make it go away (at least it is not so obvious anymore). I'll let it render for a while to see if it has gone away, I am still in doubt that it really has.

There is nothing in the back (facing her) besides the skydome I used (I removed everything to lower the texture and memory usage)

There is still a lot to learn (and videos to watch) before you know what to tweak to get good results from an exported scene from Poser.
You plugin will make that a lot easier.

Thanks!