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DHA is short for dihydroxyacetone. This tanning agent is inside all those self tanning lotions or spray on tanning products. It is actually a sugar that interacts with your skin cells when applied. It creates a sort of stain on your skin, making it appear darker.
The effects are temporary as your skin cells fall away naturally. You'll loose the color before long, usually in less than a week. If you keep reapplying the sunless tanning lotion, you'll be able to renew your tan. People like this process as they believe it is safer than using UV rays to tan.