Dry skin has a low level of sebum and can be prone to sensitivity. The skin has a parched look caused by its inability to retain moisture. It usually feels "tight" and uncomfortable after washing unless some type of moisturizer or skin cream is applied. Chapping and cracking are signs of extremely dry, dehydrated skin.  Dryness is exacerbated by wind, extremes of temperature and air-conditioning, all of which cause the skin to flake, chap and feel tight. This type of skin is tightly drawn over bones. It looks dull, especially on the cheeks and around the eyes. There may be tiny expression lines on these spots and at the comers of the mouth.

Causes
-- Poor diet. Nutritional deficiencies, especially deficiencies of vitamin A and the B vitamins, can also contribute to dry skin.
-- Environmental factors such as exposure to sun, wind, cold, chemicals, or cosmetics, or excessive bathing with harsh soaps.
-- The oil glands do not supply enough lubrication to the skin. As a result, the skin becomes dehydrated.
-- Skin gets exposed to the elements especially in winter.
-- Dry skin could be due to a genetic condition.
-- Conditions such as dermatitis, Eczema, Psoriasis, or seborrhea.

Dry Skin Could Also Be From:
-- Dry skin can be a sign of an underactive thyroid.
-- Serious skin complications can arise for people with diabetes.
-- Certain drugs, including diuretics, antispasmodics, and antihistamines, can contribute to dry skin.