Extended data:
The skin has a high neutralization ability to cold cream and vanishing cream, on the contrary, the skin has a poor buffering and neutralization ability to soap and whitening powder products. Therefore, when people often use soap and apply alkaline cosmetics, the skin is prone to inflammation or rash. Especially for people with rough or sweaty skin, the skin neutralization ability is low, so it is not suitable to use alkaline cosmetics for a long time. Studies have proved that cosmetics with strong acidity and buffering effect are most suitable for the skin.
Baidu encyclopedia -PH (skin health PH)