Benefit if it is used for a long time

korea blue serum I bought Comedon after hearing about its wide pore toning properties, it should be used once a day before going to sleep at night. I have applied sunscreen once or twice after using this serum but unfortunately it is wrong It left stains on the face Use it on a clean face at night to use it correctly, so sleep that way In this way I have seen the benefit of this serum it can create very little redness in the first use, the redness does not persist in subsequent uses

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