Fake tan applied to the skin has no established link to cancer. The active ingredient in most self-tanners, dihydroxyacetone (DHA), works only on the outermost layer of dead skin cells and does not penetrate to living tissue when the skin barrier is intact. The American Academy of Dermatology endorses DHA-based sunless tanners as a safe alternative to UV tanning. That said, spray tan booths carry a separate set of concerns worth understanding, and DHA-treated skin behaves differently in sunlight than untreated skin.
How Fake Tan Actually Colors Your Skin
DHA is a simple sugar. When you apply it to your skin, it reacts with amino acids in the stratum corneum, the very top layer made up entirely of dead cells. This is the same type of chemical reaction, called a Maillard reaction, that browns bread in a toaster. The result is a class of brown pigments called melanoidins that sit on the surface and shed naturally as your skin turns over every few days.
Because this reaction happens in dead cells, it doesn’t involve your DNA, your cell nuclei, or any of the biological machinery that drives cancer. Experimental data indicate that DHA is unlikely to penetrate deeper than the stratum corneum when your skin barrier is healthy. The FDA added DHA to its list of permanently approved cosmetic color additives in 1973, and it remains approved for external use at concentrations up to 20%.
The Free Radical Problem in Sunlight
One genuine concern is what happens when DHA-treated skin is exposed to UV light. Research using a technique that measures radical formation found that skin treated with self-tanner generated more than 180% additional free radicals during sun exposure compared to untreated skin. Free radicals damage cells and accelerate skin aging, and over time, accumulated damage can contribute to skin cancer risk.
This doesn’t mean fake tan causes cancer on its own. It means the combination of fake tan and unprotected sun exposure is worse for your skin than sun exposure alone. The practical takeaway: apply sunscreen over your self-tanner before going outside, and don’t treat a fake tan as sun protection. The brown color from DHA provides little to no UV-blocking ability.
Spray Tan Booths Are a Different Story
Rubbing DHA into your skin with a mitt is one thing. Standing in a mist of it is another. The FDA has approved DHA for external application only, which explicitly excludes the lips, nostrils, ears, and eyes. In a spray tan booth, keeping DHA out of all those areas is difficult, and the FDA has not approved DHA for use in spray booths specifically because of concerns about inhalation and mucous membrane exposure.
A 2025 study published in Toxicology Reports tested what happens when mice inhale DHA at doses comparable to a spray tan session (the European Commission estimated booth exposure at 0.21 to 0.6 mg per session). Even a single acute exposure triggered significant inflammatory responses in the lungs, including elevated levels of inflammatory signaling molecules and visible damage to the tiny air sacs where gas exchange happens. At higher doses, mice lost measurable density in their lung tissue.
The longer-term results were more concerning. When mice were exposed to low doses of DHA daily for 14 days, female mice developed signs of lung fibrosis, a condition where scar tissue replaces healthy lung tissue, along with damage resembling early emphysema. Inflammatory markers also appeared in the bloodstream, not just the lungs, suggesting some systemic response.
This is animal research, and the doses and exposure patterns don’t translate directly to a person getting a spray tan once a month. But the findings are clear enough that the FDA’s guidance is straightforward: before using a spray tan booth, confirm that the salon will protect your eyes, nose, mouth, and ears. If they can’t, go somewhere else.
How to Minimize Any Risk
If you use lotions, mousses, or creams applied by hand, your main precautions are simple. Keep the product away from your eyes, lips, and any broken skin. Apply sunscreen separately before sun exposure, because the DHA color does not block UV rays, and your skin will actually be more vulnerable to free radical damage while the tan is active.
If you prefer spray tans, use a salon that provides nose filters, lip balm as a barrier, and eye protection. Breathe through a cloth or hold your breath during application to the face. These steps address the FDA’s core concern about inhaling or ingesting DHA.
Store your self-tanning products in a cool place. DHA is a reactive molecule, and heat accelerates its breakdown. A product that has turned an unusually dark color or developed a strong smell may have degraded and is best replaced.
Fake Tan vs. UV Tanning
The risk comparison is not close. UV exposure from the sun or tanning beds is a proven carcinogen. Indoor tanning before age 35 increases melanoma risk by 59%, and tanning beds are classified as Group 1 carcinogens by the World Health Organization, the same category as tobacco smoke. A study in JAMA Dermatology described sunless tanning as a safe alternative that could help reduce skin cancer incidence by discouraging UV-seeking behavior.
Self-tanner carries no equivalent cancer classification. Its risks are limited to the free radical issue under UV exposure (manageable with sunscreen) and inhalation concerns specific to spray booths (manageable with protective equipment). For anyone choosing between a bottle of self-tanner and a tanning bed, the self-tanner is dramatically safer by every available measure.