Basic Skin Type
The most common of all skin type categories, these basics are typically the first (and only in many cases) skin types that come to mind. Dry, normal, combination, and oily are the main four however many now consider sensitive skin to be one of the core types. Your skin type is goverened by how much or how little oil your skin produces and how well it holds water.
Your skin type can be altered by smoking, diet, medication, hormones, stress, pollution (the list really does go on and on). Knowing your basic skin type isn't as important as knowing that it changes and how you treat it today may be different from how you treated it last year or in the years to come.