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Self-tanning is the process of applying a product to the skin that creates the appearance of a tan without exposure to the sun's ultraviolet (UV) rays. Self-tanners typically contain dihydroxyacetone (DHA), a colorless sugar that reacts with the natural amino acids in the skin to produce a brown pigment. Self-tanning is a popular option for people who want to get a tan without the risk of skin cancer or premature aging. It is also a good option for people with sensitive skin, as self-tanners do not contain UV rays.