A really silly question about importing textures in Blender

I do not have experience using body meshes in blender, but use for objects a lot. My guess is that the face is part of the full body texture, so using the head mesh, it isn't mapped to the right spot. When creating/modifying/redoing an object this is what I do, the process may help you figure it out.

Open the windows with texture on left and mesh on right
Put mesh in edit mode
Go to face select instead of default point select
Select one face on mesh
image on right will change with the loaded texture disappearing, just a triangle on blank background
below the texture window on left - click the up or down arrows next to the "+New" button and reselect your diffuse texture
Now move the triangle in the texture window to the portion of the texture you want.

Good luck