As you know every pore on our skin has an oil gland which makes oil to nourish our skin. In certain areas of your face oil production can be too excessive and it ends up staying in the pore making the pore look whiter. Why does the oil turn black you ask? It is because the top part becomes oxidized when it connects with the oxygen in the air and changes the color to black. That is why the common name is “Black Head”. Most people could find them along the T zone but for some people with oily complexion, they can be everywhere. Using water based skincare products with no more than 20% of oily will greatly benefit oily complexion.