Unless you know why he is getting the dry skin it can be hard to make suggestions. Four things you can do are:
1) increase fat intake with good fats like olive oil, safflower oil, sunflower seed oil,
2) Vitamin E oil both internally or topically often has good results
3)bee pollen often works well on men I think more so than women.
4)Here is a recipe recommended by Gayelord Hauser, a beauty and health writer.
Put 2 heaping tablespoons of dried peppermint leaves into a pint of water and bring to a boil.
Simmer 3 minutes and put through strainer.
Add 1 pint pure cider vinegar and then apply with cotton.