the lisa texture has a few of these anomalies. try turning off your bump map to find out if its your bump map or your texture thats the problem. then overlay a transparent uv-map of the female figure overtop of the texture map so that you can see if the texture goes all the way to the edges (i believe i had to fix a few spots on the lisa texture that didnt). if it does, then make sure that the front parts of the texture that map around and join the rear side are the same color at the edges that will meet. if theres a slight change in color/saturation/hue/brightness then you end up with these lines. theyre not hard to fix in photoshop by taking samples with the eyedropper and blending them in.