The main culprit that causes the skin to turn black and rough is the stratum corneum. If the stratum corneum can't be metabolized normally, it will accumulate on the skin surface, making the skin unable to absorb the nutrition of skin care products, thus turning black. Therefore, cleaning the aged stratum corneum once a week and using scrub exfoliating products have good results.

2. Do a good job in sun protection. In addition to the face, the neck has been drying. Therefore, when we go out every day, we should also do a good job in sun protection and isolation of the neck. Don't expose yourself to the sun for too long, which can not only prevent tanning, but also prevent premature photoaging.