In ayurveda such dry skin
is due to Vat imbalance. Excess of vaat in body leads to dryness so in diet shun all ingredients that increase vat e.g raj mash, mash . if other parameters are normal then have milk and makhan in your diet, have plenty of water and have body massage
with sesame oil preferably . make a lotion of rose water glycerine and fresh lemon drops shake it well and apply all over. if you write more details about your health i will suggest internal medicines if needed.
Dr. Rajesh Lakhanpaul