Please post a screenshot of your shader setup for this, with the displacement map image visible.

As hborre says above, but also...

It might be suffering from displacement bloat, caused by an inadvertent misuse of the displacement map within Poser. Basically, if the displacement map has a base value of around mid-grey and it is plugged directly into the displacement socket on the Poser surface, it will be wrong. You have to subtract the base colour before plugging it in, using a math subtract node with a value of the base colour of the displacement map.

There is a thread about this, with explanation by bagginsbill, which I will post a link to if I can find it again.

If the base shade of your displacement map is black, you can ignore all this.

"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)