It’s very important for you to know your facial oil and water skin type if you want your skin care products to do the very best for you that they can. If you use a product not appropriate for your skin type, even though it has the right ingredients in it, it may not only fail to help your problem, but it may make your problem worse.
Your skin has water glands that make water and oil glands that make oil, and it’s the relative balance of oil and water on the surface of your skin that determine which of the four facial oil and water skin types you have (the water and oil have nothing to do with each other). So a deficit of water is not going to be compensated for by adding extra oil.
If your cheeks feel tight or dry and appear flaky you have dry skin. If your T-Zone appears oily, feels oily, or you breakout with acne, then you have oily skin. If you have dry skin and oily skin at the same time you have combination skin. And if you have neither dry skin nor oily skin, than you have normal skin.
So if you want your skin care products to do the very best for you that they can, know your facial oil and water skin type, and choose products that are labeled for your appropriate skin type.