1. Too much dosage leads to accumulation of skin care products.

2. The skin is not suitable for cosmetics, and its absorption is poor or not at all.

3. There is something wrong with the cosmetic formula

4. When used with other cosmetics, it will destroy the stability of skin care products.

Solution: you can reduce the dosage and see if there is any. If there is, it is not a matter of dose; See if it can be used with other cosmetics. Try it alone. If it still exists, stop using the skin care product.