Texture filtering samples image map pixels adjacent to those being rendered. If the texture maps are not adequately overlapped at the seams, some blank pixels can be sampled, and this causes the visible seams.

DAZ Elite skin texture maps are like this. As Grappo2000 said, it's down to poor texture work.

Quote - What's IIRC?

If I Recall Correctly

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)