Dry skin is a common condition of the skin. It causes due to insufficient water in the most superficial layer of the skin. This problem affects both men and women equally. Older people are more prone to this problem.
The skin in elderly individuals tends to have diminished amounts of natural skin oils and lubricants. Areas such as the arms, hands, and particularly lower legs tend to be more affected by dry skin. Dryness of the skin is affected by the amount of water vapor in the surrounding air, the humidity. Dry skin is also known as xeroderma or xerosis.
Mudras will help you to moisture your skin naturally.
Mudra is a part of holistic healing Ayurveda and Yoga. It is very effective and easy to practice anyone can practice it anytime. 45 minutes of practice is enough to get a good result. Click on the links to know more about these mudras. The major advantage of mudra is you may practice it while watching T.V or traveling. To know more about these mudras click on the links.
Mudra For Dry skin/hair:
Vaayu-shaamak

Apaan mudrā

Kapha-Kaarak or Pitta-naashak mudrā

Jal –vardhak or Varun mudrā

Prithvi-vardhak or Prithvi mudrā

I think this mudra is helpful for you.Also, read my book "Complete Hand Mudras." It will give you more information about mudras read more