Oily Skin occurs due to overproduction of sebum from sebaceous glands. Sebum is the waxy, oily substance that protects, hydrates and moisturize the skin. However, too much sebum can lead to oily skin, clogged pores leading to a host of skin imperfections.
As for combination skin is usually oily in the t-zone(forehead, nose and chin) whilst being normal or even dry on the cheeks. Washing regularly can help to reduce the amount of oil on the skin. Wash with a gentle soap and warm water. Avoid soaps with fragrances, added moisturizers or harsh chemicals, which can irritate or dry out the skin, ended up creating more sebum.
