That loks like a double surface. The best fix would be to remove the inner layer of polygons (if thet were added to avoid a see-through inside in Poser it would be better to use the Normals forward setting for the surface in the Material room instead of adding mesh). An alternative would be to apply a white image to the displacement channel in the DS Surfaces palette with a very low strength so that the surfaces get pulled apart ractionally when rendered.