Why does salicylic acid have a specified concentration? What are the effects of salicylic acid?

When using salicylic acid, it is recommended that you start with a low concentration. Salicylic acid is somewhat irritating, so it should be used with caution, especially on sensitive skin. No matter how high the concentration of salicylic acid is, its effect is limited. Don't blindly pursue high concentrations.

Because high concentrations can be irritating, salicylic acid is usually added at a concentration of 3-6%. If it is higher than 6%, it will be destructive. Generally, a concentration of 0.5%-2% has a certain exfoliating, antibacterial, and anti-inflammatory effect. In other words, irritation limits the concentration, and the concentration limits the effect. The limited effect allows it to only deal with some mild to moderate acne. If the concentration of salicylic acid you use is less than 0.5%, even mild acne cannot be subdued.

Salicylic acid, BHA has fat-soluble properties and a larger molecular weight than fruit acid. It can lock the effect in the shallow keratin and has the effect of removing keratin. This is one of the most important functions of salicylic acid. The fat-soluble properties of salicylic acid can penetrate into the stratum corneum and deep pores by fusing with oils and greases to unclog the pores. After cleaning the clogged pores and removing the blackheads, the pores will of course appear smaller. Using the effect of salicylic acid, you can find that many blackhead removal solutions currently use salicylic acid.

Salicylic acid is toxic to a certain extent and is classified as a medical product, which means that it can only be used under the guidance of a doctor. Salicylic acid has the effect of removing skin keratin when the concentration is 3-6%. It is corrosive to the skin above 6%, and serious damage may occur at above 40%. Its safety is not as good as that of fruit acid. Excessively concentrated salicylic acid has a strong corrosive effect. It is recommended not to let salicylic acid contact the facial skin to avoid causing damage to the facial skin.

1. There are many kinds of exfoliating skin care products on the market, such as A acid, retinol (aldehyde), fruit acid, salicylic acid, and even azelaic acid, all of which have the effect of exfoliating and promoting skin metabolism. These exfoliating products should not be used at the same time.

2. When the skin is fragile or allergic, such as sunburn, itching, stinging, peeling, etc., it is not suitable to use salicylic acid products, which will cause excessive irritation or burns.

3. Exfoliation will reduce the protective power of epidermal cells, so more attention should be paid to the use of moisturizing and sunscreen.

4. For sensitive or seborrheic skin that needs exfoliation, it is best to choose less irritating salicylic acid or lactone gluconic acid, which will cause less burden to the skin.