What's the best skincare product for dry skin?

Moisturize. Avoid things that make you break out, soaps & wetness. Wash your hands only when necessary. Wear gloves when needed. Wear clothes made of cotton. Bathe only with a small amount of mild unscented soap, such as dove. Keep the water temperature cool or warm, not hot! use the medicine your doctor gave you. Use a plain moisturizer daily. Avoid scratching or rubbing the itchy area. Manage stress.
Many great options. Since you have a lot of options in terms of producs for dry skin. Try to avoid the hash chemicals and preservatives. Avoid parabens, pthalates, mineral oil, artificial fragrances. Recommend using the apple phloretin hydrator from cosmo grade, or perhaps some from skinceuticals.