It's very easy to notice if you have oily skin. Wash your face in the morning, and then look at your skin in the afternoon. Is your face shiny? can you actually see little beads of oil on your nose and forhead? If you press a blotting sheet on your face, does a lot of oil appear on the sheet, or just a tiny bit? Every skin produces oil, but when you have oily skin, it produces excess oil. Another way to tell is acne. Usually, those with more oily skin are more prone to acne, so if you have breakouts a lot, that's another indicator of oily skin.