Xerosis Cutis is a disease of the Skin.
The abnormally dry skin is termed as Xerosis Cutis.
It is more common in old age.

Skin is a very important and large part of the body. It protects the body by preventing germs and pathogens in the body. A healthy skin needs proper moisture and retention of water. If the skin loses oil and become dehydrated, it causes dry skin. The condition is known a Xerosis Cutis.
The skin becomes tight and scaly. If it occurs with age then it is not a problem. But if it occurs at young age then it is a problem.

Causes of Xerosis Cutis
Old Age
Diabetes
Dehydration
Skin Problems
Family History
Kidney Problems
Genetic Disorder
Liver Disorders
Thyroid Problems
Sjogren's Syndrome
Weather Conditions
Using harsh cosmetics
Nutritional Deficiency
Deficiency of Vitamin A
Excessive exposure to sun
Frequent bath with hot water

If not treated properly, Xerosis Cutis may cause
Infections
Permanent damage to the Skin