Oily skin generally appears “shiny” with no dry areas. Also known as seborrhoea, oily skin is caused by overactive oil-producing (sebaceous) glands, which cause the face to appear shiny (especially on the chin, nose, and forehead). People with oily skin often have enlarged pores, making their skin more prone to blackheads, pimples and acne.
People with oily skin are more prone to acne and oily hair.

Oily skin requires careful cleansing using hot water to prevent clogging of the pores. Hot water dissolves skin oil better than warm or cold water.
When you cleanse oily skin you should use oil-based products. Although this may sound counter-productive, it should be noted that oil-based products help to dissolve sebum.

High-protein diets can be useful for treating oily skin. You should reduce your intake of sugar and salt. Make sure you drink plenty of water to help to hydrate your skin and flush out toxins.
Reduce your intake of fats and especially avoid deep-fried foods.