Self-tanning lotions are cosmetic products designed to give the skin a sun-kissed glow without the need for sun exposure. They contain active ingredients, such as dihydroxyacetone (DHA), which react with the amino acids in the skin's outer layer to produce a temporary tan. These lotions come in various formulations, including creams, gels, and sprays, allowing users to choose the type that best suits their preferences. To use self-tanning lotions effectively, it's important to exfoliate the skin beforehand to ensure an even application. After applying the lotion, it typically takes a few hours for the tan to develop fully. Results can last several days, and reapplication is necessary to maintain the desired color.