Knowledge of individual skin types and properties is vital when selecting optimal skin care products and treatment regimens. There are five generally accepted basic face skin types – dry, oily, normal, combination and sensitive. However, one should note that individual skin types may change at different times during one’s life due to external (e.g. climate, skin care, etc.) and internal ( e.g. medications, illness, hormonal changes) factors. In addition, several skin types and properties may be present simultaneously in an individual in different locations (e.g. oily skin with irritated patches of skin).