Oh yes that will work.

Okay, lets make a scar on the face (works for the body too).

First thing you need to do is import your face texture map into PS as a base layer

Add two more layers

First layer above the base, name it black (you will flood it all black)

Top layer will be your scar and we will start there:
         Decide on how wide you want it to be and select white
         Draw a white line on the portion of the face you want
         Layer just above your base face texture---- flood it black.

You should now have a white line on a black background.
Now save the black image twice, one in .PSD to preserve the layers, the other as a say a .png (can be any format that your Poser Material room will recognize) in a file that you can easily find, label it face scar.

Keep PS active (you may want to make changes) also the reason for saving everything as a .psd.

Now open up Poser  and import the model that the face texture comes from (probably V3 or V4, but it can be Alyson, etc).

Go to your friendly Material Room:  We are going to use one MATH node called BLENDER-don't get a sick feeling in your stomach because of the four letter word MATH and a 2d image node.

This is what you do:  One the picture displayed, click on the face

                                      PoserSurface:  you should already have at least one node there called
                                      Image_Map, break the connection between your PoserSurface and
                                      that node by cliicking on that channel's tiny male plug                   
                                      Click on the PoserSurface's tiny male plug  and Disconnect.

                                      Click on that tiny male plug again pass your cursor over it, a new menu
                                      pops up pass over  new node and select blender.  You now have another
                                      node.

                                      Now you need to connect the blender node to the Image_Map node. 
 
                                      Click on the tiny male plug on Input_1 and drag the line to that big honker 
                                      male plug on Image-Map (the plug is located on the left side of the 
                                      Image_Map).

Your face image should appear on the bottom of the Poser Surface, don't worry about the light change.

On the blender node, select the third channel labeled Blending and it's male plug>new node>2d texture>image_map, you should have another node now called Image_Map_2, click on Image.Source NONE , then on Browse and locate your scar.

Now note the picture at the bottom of your PoserSurface, it changed back to normal with the scar (You will just barely see it ).  However you won't in the main picture until you render it.

Back to the blender node:  Third channel you see the .5 number, decreasing it makes the scar less visible, increasing it, makes the scar more visible.  Make test renders

Input_2, the second channel, make it dark red makes the scar  some form of red (depending on the third channel's setting. Make a test render

Now if you want to get fancy.  Connect up the bump channel to your Image_Map_2 male plug on the left side (only plug there) and adjust the bump channel number to taste.  Make a test render

Fiddle around with the stuff to fit your taste and you have a scar.

If the scar line is not exactly right go back to PS and modify the puppy.

This process works for the body too and for tatoos, cheek and eye makeup, covering certain parts of the body with body paint, designs and other skin fits.

Add more nodes to other Poser Surface channels for other effects and soon you will give Bagginsbill a run for his money (I never will, but you can).

Jan