The main reasons for foam in toner are as follows:
1. Ingredient problem: The toner may contain surfactants, which will produce foam when contacting the skin. If there is more foam, it may be because the content of surfactant in toner is high.
2. Skin state: too thick stratum corneum: too thick stratum corneum will affect the absorption of toner, causing the toner to form foam on the skin surface. This is usually related to metabolic abnormalities in the stratum corneum of the skin, which can be improved through regular exfoliation. Dry skin: when the skin is short of water, the ingredients in the toner may react with the oxygen in the air when applying, resulting in foam. In this case, skincare products containing moisturizing ingredients should be used and sufficient water intake should be maintained. Excess skin oil secretion: when skin oil secretion is excessive, ingredients in toner may produce foam after mixing with sebum. This may be caused by excessive activity of sebaceous glands, which can be improved by using oil control products and regular cleaning.
3. Usage: When the toner is slapped or shaken, its surface active ingredients will produce foam. This is a normal phenomenon and does not affect the effectiveness of toner use.
If the toner itself has quality problems, such as impurities or expiration, it may also cause foam when applied. When choosing and using toner, attention should be paid to the quality and shelf life of the product to ensure that it is suitable for individual skin types and needs.