Salicylic acid is only locked in the superficial stratum corneum, only to play a simple treatment and block the role of the change in skin texture is only a moment, and fruit acids into the dermis from the root of the change in skin texture, can be cured, as for the dermis is damaged to the formation of acne pits, salicylic acid role appears to be unable to do so, so the salicylic acid can not be called "Salicylic Acid The first thing you need to do is to get a good deal on your own.

2, safety

Because fruit acids are not toxic, can be used from low to high (8%

-15%-20%-30%-40%). Salicylic acid, on the other hand, is toxic, too high a concentration is not suitable for use on the face, there is a certain concentration limit, the concentration of 3%-6% of salicylic acid can be used to exfoliate, higher than 6% of corrosive to the skin, 40% high concentration of salicylic acid has a strong keratin corrosive properties.

Extended information:

Exfoliating reasons:

1, The stratum corneum is our outermost layer of skin tissue, 28 days is a cycle of its metabolism. The stratum corneum has the role of skin protection, moisturizing, sunscreen, and at the same time can effectively prevent the invasion of some microorganisms and bacteria. If it doesn't completely fall out of our skin during the normal metabolic period, then over time our stratum corneum will slowly build up, leading to a variety of symptoms, such as acne.

2, because a lot of things skin rough, not smooth enough, skin color appears dull, yellow, these are likely to be due to too long did not exfoliate and caused.

Baidu Encyclopedia - Salicylic Acid

People's Daily News - Why Exfoliate?

4 points to note when exfoliating