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 a natural tan without the need for sun exposure, making it a popular choice for those seeking a sun-kissed look. DHA is considered safe for topical use and is often found in lotions, sprays, and gels. The effects typically last for several days, gradually fading as the skin naturally exfoliates. It is important to apply DHA products evenly to achieve a uniform tan.