If your skin is very oily, use a gentle face scrub every couple of days to keep it clear and reduce sebum build up. Excess sebum can build up in pores, leading to spots and blackheads. Be sure to focus on the T-zone, as this area has a higher concentration of sebaceous glands. But do go gently ; excessive cleansing and scrubbing can lead to a production of even more oil, as your skin works to replace what's missing.