According to texts of ayurveda dry skin
http://www.ayurhelp.com/Dry_skin.htmis caused by vata dosha. When vata dosha increases in body it reduces kapha and makes skin dry and wrinkled. ( Kapha keeps skin soft and smooth where as vata makes the skin dry and rough. Vata dosha's qualities are opposite to kaphadosha qualities ).
The causes which increase vata dosha in body1.Exposure to cold and dry climate
2.Controlling natural urges like urination, defecation, hunger, thirst, etc.
3.Staying awake at unearthly hours ( late night).
4.Irregular food habits.
5.Excess physical and mental exertion.
6.Consumption of spicy, dry, bitter food.
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