I've never had skin issues, and tend to have even smoother skin on this type of diet, but I DO feel especially dry/parched when eating RAF (I'm probably eating more from dairy, getting much of my fat from butter, some from animal fats, organs and whole egg)
I do tend to drink less/little water doing the diet this way but it seems even if I was to drink more that it makes little difference.
I bring this up only to mention that by logic, or from RPD/primal claims, this makes little sense, as I consume no cooked food, which is incredibly drying, and I consume tons of fat, which is supposedly lubricating. dust and other factors seem to dry me out much more than the average person, and I imagine humidity does the same IICR when I was doing the diet at the beginning of last summer. Before doing raw again this time around, I did basically cooked paleo/primal and didn't experience the same kind of dried out feeling, which leads me to believe there is something going on internally (either positive that requires more moisture/lubrication to facilitate such as getting rid of poisons, or possibly negative:undefined, requiring more water or other lubrication, than even a normal person who drinks coffee and eats crap) that is accelerated on an all-raw diet.