The Oily-T is the region where people tend to have problematic/oily skin.

With the shape of a T, the skin oil is concentrated at the forehead, nose and chin. Ruth Swissa explains that the forehead oil is mainly caused by diet (greasy food). Swissa clarifies that cheek breakouts are caused by air-quality (you will notice cheek pimples usually form after airplane rides or areas of high smog). Lastly, she explains chin acne is caused by hormones (PMS menstral breakouts usually inhibit chin area).