my experience is to use 3-4 layers and experiment with levels, curves and indeed diffuse glow...use DG after skin treatment...this will sometimes enhance the white more and mask out everything besides the skin...use higpass filter to keep detail in skin/pores...then use curves adjustment layer and then levels to enhance the white more...<i don'tknow any specific detail sourounding this question, but I have had much pleasure in using these tools to do so...
here is one attempt, but maybe abit to much loss of detail in the white...
Gerry
I've added a blue filter to give it more icey,but....well...yeah!