Dry and dull skin can give you an outdated appearance and make you look older than you. In fact, excessive dryness can damage your skin and make it dark and scaly. Dryness often causes itching on the skin. If left unchecked, this can lead to more serious conditions such as eczema or dermatitis. Dryness of the skin occurs when your skin cannot store moisture. The skin often dries and exfoliates in the winter months when the air is less moist.