Washing your face will help get rid of all the dust, dirt, grit, and oil that gets on your skin during the day. Washing your face too often, however, will strip the moisture and natural oils from your skin. This will cause your skin to produce even more oil to compensate. In turn, this will lead to even more breakouts and acne.  If your skin gets oily during the day, try blotting the oily spots with blotting papers. You can find them in most beauty shops. Avoid using hot water when washing your face. Hot water can be very drying. Use warm water instead, and rinse with cool water when you are done.  Always wash your face and remove your makeup before going to bed. If you leave makeup on, you may clog your pores and end up with a breakout. There are different types of cleansers available, and some are meant to help certain problems, such as acne, oiliness, or dryness. When choosing a cleanser, avoid anything that is heavily perfumed or colored, as it may irritate your skin. Try finding a cleanser that is also exfoliating. Exfoliants will help buff away the dead skin cells, and reveal the bright skin underneath.  If you have dry skin, look for something that says "hydrating" or "moisturizing." If you have oily skin, look for something that is oil-free, or is labeled "for oily skin." If you have acne or blackheads, try using something that says "deep cleaning" or “purifying.” These products will flush out the dirt inside your pores. This is especially important for those battling acne. The more you touch your face, the more dirt and bacteria you get into your skin. This will lead to more acne and breakouts. This could lead to more redness, or worse: scarring. Try using a sulfur-based pimple treatment instead. If you must pop pimples, soften your skin first with steam or a washcloth soaked in hot water. Use a sterilized pimple extractor rather than your fingers. When you’re done, gently clean the area with rubbing alcohol. Toners help re-balance your skin's pH and tighten pores. Moisturizers help hydrate your...

TL;DR in Chinese:
每天至少洗一到两次脸。 用适合自己皮肤类型的温和洗面奶。 尽量不要过于频繁地触摸面部。 不要挤粉刺。 使用面部爽肤水和润肤霜。 选择合适的粉底。 让化妆刷保持干净。 享受阳光，但一定要做好防晒。