Difference 1: Fruit acid is a variety of organic acids extracted from fruits, including grape acid, malic acid, citrus acid, lactic acid and so on. Because most of them are extracted from fruits, they are called fruit acids. Salicylic acid is extracted from willow bark, white pearl leaves and sweet birch in nature. Lactic acid is obtained by fermentation.
Difference 2: Different pH values. Fruit acid is a weak acid, which is beneficial to the function and preservation of fruit acid in acidic environment. In alkaline environment, fruit acid will dissociate and lose its function. Salicylic acid is more acidic than fruit acid, so it should be operated under the guidance of a doctor regardless of its concentration.
Difference 3: Different functions. Fruit acid can reduce the cohesion between epidermal keratinocytes, remove aged keratinocytes, improve roughness and dullness, and regulate skin. Salicylic acid is only locked in the surface stratum corneum, which only plays the role of simple treatment and sealing, and the change of skin quality is only temporary. Lactic acid is generally not suitable for brush acid.
Brush acid law:
Try from a low concentration (1-4%) and establish tolerance in a small area. If the skin is seriously damaged, such as sunburn or allergies, it needs to be repaired. You can use a soothing and moisturizing mask for three days to adjust your skin to a healthier state. Wash your face with mild amino acids, and pay attention to dry the water after cleansing. Do not use moisturizing products until the acid is completely absorbed.
Within 3-7 days after starting to use, some people will have peeling and serious oil production, so don't worry. After the skin adapts, it will make the skin's water storage capacity stronger. Pay more attention to sun protection during the use of fruit acid. At the same time, do not use other functional products, and avoid using cosmetics containing acidic ingredients such as A acid and salicylic acid.
Refer to the above content: Baidu Encyclopedia-Fruit Acid