Painting a scar on a skin texture
I've painted scars on human skin textures before but it's been two years since I last needed to do that and I've completely forgotten how to do it! I need help!
I need to paint a long and thin old/healed scar on a V4 character's face that looks as real as possible. I looked at those sets by Shana at Renderosity but they look too fresh for what I have in mind. The scar (according to the story) is from an old katana wound, if that helps explain what I'm needing.
My available tools are Poser Pro 2012, Photoshop CS5, and Zbrush.
Any hints, tips, tutorials, etc. would be greatly appreciated!