Dry skin is a very common skin condition characterized by a lack of the appropriate amount of water in the most superficial layer of the skin, the epidermis. While dry skin tends to affect males and females equally, older individuals are typically much more prone to dry skin. 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. Environmental factors, such as humidity and temperature, have a profound effect on the amount of water retained within the skin. Frequent hand-washing and sanitizing causes evaporation and dryness. Dry skin may also be a side effect of some medications as well as a byproduct of certain skin diseases.