Sugar cherishes the bacterial strain on the skin. When the skin’s own bacterial strain strengthens, it creates a lot of lactic acid on the skin. Lactic acid is a metabolism product of the bacteria. It belongs to normal skin. Lactic acid keeps the skin suitably acidic. The main property of sugar in skin care is to act as a prebiotic. Increased bacterial activity brings alpha hydroxy acid (AHA) to the skin, which is classified as a fruit acid.