1, improper use: for example, the cleanser used does not choose products with strong cleaning power, and after cleansing, it does not remove excess oil, but remains on the skin, so that pores will gradually be blocked by oil, which is not conducive to excretion, resulting in dull complexion.

2, seasonal changes: climate changes in different seasons have a great impact on the skin, especially in dry winter or hot summer. The time of using this product coincides with the temperature change, so this is also one of the reasons for the skin change.