At 20, our skin is often dehydrated yet produces too much sebum - the T zone is a classic example. So you'll need to both purify and hydrate your skin. Avoid soap and products that contain alcohol, as these will dry out your skin, which in turn will produce more sebum to compensate for any water lost. In the morning, wash your face with a gentle cleansing gel, micellar water or a purifying mousse to help regulate any excess sebum. Follow with a moisturiser that will nourish your skin. At 20 our skin doesn't need any specific treatments - you can leave firming and smoothing creams for later in life! In the evening you'll need to get rid of any grime accumulated during the day (make up, dust, pollution, sebum). Give your skin a thorough cleanse, use a face scrub once a week and apply a moisturiser before going to bed. You can also start using an eye contour cream. Eye contour skin is much thinner and more delicate than the rest of the face, so to avoid crow's feet at 40, you should start pampering your peepers now!