Just some of my links to bits and pieces related to skin texturing. Hope you'll find some of them useful.
Forum tutorial on CGTalk on making a face texture from scratch.
Leigh van der Byls realistic skin tutorial. Look at the colour map texturing section for some tips on facial skin texturing.
is a facial skin texturing tutorial, but its in French! The link runs
it through the babelfish translator. Broken english but you can get the
Texturing a face using photos.
Simple skin texturing tutorial.
Tutorial on creating a palette of human skin and lip colours.
Samples of skin texture that you can cut and patch together right here.
Some general photoshop texturing tips can be found here in the articles section.
How to make burnt flesh in PS. Just in case you want burnt skin.