First, read the English article below.

Lemon juice is incredibly acidic, leeching out natural oils and disrupting your skin's natural pH. Not only this, but people with sensitive skin will have a much worse time dealing with too much lemon juice. Remember, a little goes a long way. Just because a little is good doesn't mean a lot is better! If your acne is bad and you've got open sores or lesions, lemon juice probably isn't what you want. While it may fight the acne, it probably hurts the surrounding skin, leaving it worse off. You can try using lemon juice on active acne that isn't opened or hasn't been popped. Discontinue if your skin develops redness, irritation, or breaks out. Lemon juice will make your skin particularly susceptible to sun damage.  This is why many people choose to use lemon juice at night instead of the morning, and then wash the lemon juice off when they wake up. If you do choose to use lemon juice on your skin during the day, take care to protect your skin from sunlight: Wear sunscreen, don a hat, etc. If you want to try lemon juice on your skin to heal acne and acne scars, be careful about using other skin-care products in combination with lemon juice. It might be helpful to use lemon juice on your skin on those days when you're not using benzoyl peroxide, salicylic acid, etc. for your skin-care routine. 

Now, please write a short abstract for it in Chinese. Abstract:
不要拿整片柠檬直接在脸上涂抹，也不要涂得满脸都是。 不要往伤口上涂抹柠檬汁。 涂抹柠檬汁后不要长时间晒太阳。 将柠檬汁和其他产品一起使用时要小心。