A common symptom of oily skin is enlarged pores leading to blackheads and breakouts due to excess oil or sebum, which is produced by the sebaceous glands and secreted through your pores. When this process goes smoothly, sebum not only lubricates your skin, but it also removes dead skin cells and other irritants from your pores. However, when your body produces excess sebum, it clogs your pores leading to blackheads and blemishes. So if your pores are more visible and your complexion has a tendency to look shiny through the day, your skin is oily!
 
Most people who have oily skin often wonder what they're doing wrong to cause so many skin problems. They may blame it on the greasy food they eat, but the fact is that your diet can aggravate acne, but it doesn't cause oily skin! If you’re still not sure about your skin type, take a tissue paper or a paper napkin and press it to your forehead, nose and chin. When you pull it away, the paper will be translucent as your skin has left behind an oily residue. This is a major symptom of oily skin.