Even if you have really oily skin, it still needs moisturizer. The trick is finding the right weight (thickness) for your skin. Unfortunately this is done through trial and error, but typically, the oilier the skin, the lighter you want to go on lotion thickness. You don’t have to drop a lot of dinero to get a good moisturizer either. But you should get a non-comedogenic moisturizer to keep pores from clogging (try Cetaphil Daily Facial Moisturizer, $10.95). If it doesn’t say non-comedogenic somewhere on the bottle, don’t use it.