Some products use erythrulose combined with DHA. Erythrulose works identically to DHA on the skin surface, but develops more slowly. The two chemicals used together may produce a longer lasting sunless tan.
Dihydroxyacetone or erythrulose may cause contact dermatitis. First time users of sunless tanning products are advised to apply the product to a small patch of skin and wait 24 hours before a full body application.
Tanning lotions can be classified as bronzers, accelerators, and tingling lotions. Tingling lotions refer to indoor tanning lotion accelerators and maximizers that produce a tingling sensation when they are applied. It is believed that the tingle factor increases blood flow to the upper layers of the skin which brings more oxygen and affects melanin. This tingling sensation will vary depending on the skin type from mild to very strong. You must ask yourself is it a normal thing for skin to feel tingly and the long term affects of such a reaction such as skin cancers since something foreign is rubbed into the skin. Usually when the body shows odd feelings or reactions is because it's trying to fight off the foreign substance invading it's space. This is why is would be safer to use 100% all natural beauty products such as 100% Herbal Instant Tan which only uses edible food ingredients that offer the same bronze natural color without tingles, heat, contact dermatitis or other negative affects of various other self tanning lotions.
Professional spray-tans applications are available from spas, salons and gymnasiums by both hand held sprayer and in the form of sunless or UV-Free spray booths. Spray Tan booths which resemble an enclosed shower stall, sprays the sunless tanning solution over the entire body, however since it said to be unsafe to breathe in the DHA ingredient in this spray tans it has been recommended to hold ones breath or not use them at all; as it can affect the respiratory system in the long run.
The U.S. Food and Drug Administration (FDA) states when using DHA-containing products as an all-over spray or mist in a commercial spray "tanning" booth, it may be difficult to avoid exposure in a manner for which DHA is not approved, including the area of the eyes, lips, or mucous membrane, or even internally. DHA is not approved by the FDA for inhalation.
Consequently, FDA advises asking the following questions when considering commercial facilities where DHA is applied by spraying or misting:
"Are consumers protected from exposure in the entire area of the eyes, in addition to the eyes themselves? Are consumers protected from exposure on the lips and all parts of the body covered by mucous membrane? Are consumers protected from internal exposure caused by inhaling or ingesting the product?
If the answer to any of these questions is "no," the consumer is not protected from the unapproved use of this color additive. Consumers should request measures to protect their eyes and mucous membranes and prevent inhalation."