You might be suffering from xerosis. This is a condition which results from dryness of skin. Please use a very good moisturiser/ emollient. I don't think I can take brand names here. But you can contact me if you need any further details regarding that. There is a specific way of using moisturisers. Apply them on slightly moist skin immediately after bath and apply it again at bedtime. Use lukewarm water for bath. All this is assuming you have no other medical issues like thyroid/ diabetes. if you do,the line of management changes.