Another limitation of skin type is that it cannot address skin-care needs that may not be apparent on the skin’s surface. For example, sun damage is not evident when you are younger, but sun protection is imperative for all skin types. Oily and dry skin present at the same time, along with some redness, may be an early sign of rosacea, not just a sign of combination skin, and rosacea is a condition that cannot be treated with cosmetics and is not easily diagnosed. What you see on the surface of the skin does not always indicate the type of skin-care products you should buy.
Source Fat Cutter Powder