When you travel, your knees get sunburned first. It's dark and purple now, but it doesn't hurt anymore. Particularly obvious and serious. Can someone help me restore whitening?

The skin is sunburned and it is difficult to whiten quickly in a short time. In a few days, the skin will fall off. New skin will grow inside. It will still be white then. Don't worry. I remember that after I went to the water park last year, my whole face was red and my arms were red. It took half a month to take off all the dead skin. Pay attention to put on some insulation after taking a shower.