If you suffer from oily or combination skin, sebum is usually to blame. A natural oil, sebum is present in everyone's skin, where it provides much-needed moisture to keep the tissue supple and healthy. In some people, the sebaceous glands produce excessive amounts of sebum, leading to a buildup of oil all over the face or in the T-zone area of the forehead, nose and chin. Oily skin is prone to acne breakouts, blackheads and unsightly, large pores and requires beauty products custom-formulated specifically for its unique needs. The Kerstin Florian Clarifying collection was developed exclusively for oily and combination skin by Kerstin Florian, one of the leading names in beauty.