On the safety of glycolic acid for dark skin
The safety of glycolic acid for dark skin has been debated. Glycolic acid belongs to α-hydroxy acids, which are often used in skin care preparations because of its ability to promote stratum corneum renewal and improve skin texture.

However, dark skin has active melanocytes and darker skin tone, and the reaction to such acids may be different from ordinary people. It is said that glycolic acid is used for dark skin, or causes skin irritation, such as redness, itching, and burning. This is because glycolic acid can cause short-term damage to the skin barrier and irritation of nerve endings.

And dark skin is more susceptible to post-inflammatory pigmentation after being irritated. If the concentration of glycolic acid is too high and the frequency of use is too frequent, melanocytes will over-secrete melanin due to inflammatory stimulation, causing local skin color to deepen and affecting the appearance.

However, there are also dissenters. If used properly, glycolic acid can also exert its skin care effects on dark skin. When using for the first time, it is advisable to choose low concentrations, such as 2% - 5% glycolic acid products, and the frequency of use should be sparse, such as once a week, after the skin adapts, it is appropriate to increase the concentration and frequency. At the same time, use soothing and moisturizing skin care products to protect the skin barrier.

In summary, glycolic acid is not completely necessary for dark skin, but it needs to be done with caution. Users should carefully observe their own skin conditions and use them according to scientific methods in order to avoid harm and maintain skin health.