Vitamin C and hydroquinone have long been highly coveted for diminishing hyperpigmentation. However, tranexamic acid has been rising in the ranks as one of the most popular ingredients in the newest dark spot treatments on the market. Lately, every new skin-care launch that helps reduce the appearance of post-inflammatory hyperpigmentation or melasma seems to tout an acid of the tranexamic variety. Unlike many acids of the likes of exfoliating lactic and glycolic, this one is safe for all skin types, complexions, and use during pregnancy. In fact, tranexamic acid is less irritating than most dark spot-diminishing ingredients. Unlike controversial hydroquinone, it does not come with the risk of "ochronosis, a rare paradoxical pigmentation of the skin," says board-certified Y. Claire Chang. "Due to this, there are limitations in how long you can use hydroquinone."