Get rid of excessive oiliness. Oil build up causes skin to look dull, a very common problem in adolescents and young adults. Wipe your face with rosewater or any other toner that suits you several times a day. Applying a non comedogenic (that does not block skin pores) pressed powder foundation can also keep your skin looking fresh for a longer time. However, avoid washing your face with soap more than once or twice a day to reduce oiliness. Doing so can actually stimulate oil production.