For more than ten years I have had very dry skin, especially on my lower legs, and ankles. Dry skin loves sugar, and diabetes can cause that dryness. I use Lubriderm on my skin to keep the itching and dryness down to a minimum. I used to scratch my legs in my sleep, and dried blood was there in the morning. One link below from WebMd gives a quiz and information about diabetes and dry skin.
I also have very dry eyes, and have used eye drops (artificial tears), several times day and night for several years. My ophthalmologist prescribed a medication (Restasis) that is supposed to help my eyes to start producing their own tears again. It has helped a little, but not much. Here is a link about diabetes and dry eyes.