Oily skin is the result of the overproduction of sebum from sebaceous glands. These glands are located under the skin’s surface.Sebum is an oily substance made of fats. Sebum isn’t all bad because it helps protect and moisturize your skin and keep your hair shiny and healthy.
Too much sebum, however, may lead to oily skin, which can lead to clogged pores and acne. Genetics, hormone changes, or even stress may increase sebum production. Your facial routine is very important, either in the night or day time.