Is self-tanner carcinogenic?

Getting a tan without sun exposure can alter sun-related behavior. Artificially darkened skin can give the illusion of increased protection, which may reduce vigilance. A study of 2,005 South Australians found that regular self-tanner users were more likely to develop sunburn than non-users, despite more frequent sunscreen application. This paradox raises important questions. Several hypotheses may explain it. On one hand, the amount of sunscreen applied may be below the recommended 2 mg/cm² needed to deliver the stated protection factor. On the other hand, reapplication, essential every two hours or after swimming, may be neglected.

In addition, a 2015 US survey of more than 27,000 adults found that 6.4% of respondents reported using self-tanner. Although self-tanner is presented as a safe alternative to UV tanning, the study found that these users engage in risky behaviors : they use tanning booths more often, experience more sunburns, and wear less protective clothing or seek shade to shield from UV rays, even though they apply sunscreen. These data raise the question of whether self-tanner alters sun exposure habits or coexists with risky practices without correcting them.

By coloring the skin, a self-tanning product can create a false sense of sun protection.

In summary, a self-tanner colors the skin without sun exposure and to date does not show carcinogenic effects. Its mechanism relies on the formation of melanoidins on the surface without activating melanogenesis. Note that it offers no UV protection. Artificial tanning does not protect against UV rays. To maintain skin health, applying a self-tanner does not replace rigorous, repeated sun protection.