Skin Types Skin are classified into three types : Oily, Dry and Combination. Also normal skin type can be added. Oily Skin arises from the over production of Sebum. What is Sebum ? Sebum is the oil generated by the sebaceous glands. Suffer : People with this skin type are usually desperate to eliminate shine from their face, especially in the T-zone. T – zone is forehead, nose and chin.