If it is dry skin, you can do a few things. You can try using a humidifier in the house, suppliment the diet with omega 3 fatty acids, or start feeding a food that's high in the omega 3 fatty acids. DVM makes a shampoo that also helps with dry skin. It's called Hylite, but you would need to get it from a veterinarian or online.
Just be sure to make sure it's just dry skin, and not an underlying problem