Dihydroxyacetone (DHA) is a colorless sugar that is commonly used in self-tanning products. When applied to the skin, it reacts with the amino acids in the outer layer, resulting in a temporary browning effect. This process mimics the appearance of a natural tan without the need for sun exposure. DHA is considered safe for topical use and is often found in lotions, sprays, and gels. The tan typically develops within a few hours and can last several days, gradually fading as the skin naturally exfoliates. It is a popular choice for those seeking a sun-kissed look without the risks associated with UV radiation.