Self tanner turning green is one of the more alarming things that can happen mid-application — but it’s more common than you might think, and in most cases it’s completely fixable. The green color you’re seeing isn’t your tan going wrong. It’s either the cosmetic guide color in the formula degrading, or a chemical reaction happening on the skin’s surface before the DHA even begins to develop.

Self tanner turns green for three main reasons: the product has expired and its colorants have broken down, it has been stored incorrectly and oxidized, or the skin wasn’t properly prepped and the formula is reacting with something already on the skin — most commonly deodorant, perfume, or a residual lotion.

The good news is that in nearly all cases, the green color washes off in the shower and the DHA that gives you the actual tan continues to develop normally underneath. Here’s a full breakdown of why it happens, how to fix it, and how to make sure it doesn’t happen again.

Key Takeaways

Green self tanner is caused by colorant breakdown in expired product, oxidation from poor storage, or a chemical reaction with products already on the skin
Deodorant and perfume are the most common culprits for green patches — they raise the pH of the skin and interfere with how DHA reacts
The green color is almost always in the cosmetic guide layer — it washes off in the shower and the underlying DHA tan should develop normally
If the product itself is green inside the bottle, it has oxidized or expired and should be replaced
DHA weakens in expired products — even if the green washes off, the resulting tan may be paler than expected
Store self tanners with the lid tightly sealed, away from heat, light, and humidity to extend their lifespan
Always shower off residual deodorant, perfume, and lotion before applying self tanner to avoid pH-related reactions
Most self tanners last 6–12 months — check the PAO (period after opening) symbol on the packaging

Why Does Self Tanner Turn Green? The Full Explanation

To understand why green appears, it helps to know how self tanner is formulated. The active tanning ingredient in most self tanners is DHA (dihydroxyacetone), a colorless sugar compound that reacts with amino acids in the outermost layer of skin to produce a brown pigment [Petersen et al., Journal of Cosmetic Dermatology, 2018]. On its own, DHA would be invisible until it develops — so manufacturers add cosmetic guide colorants to the formula. These colorants (often violet, green, or blue-toned) serve two purposes: they help you see where you’ve applied the product, and they counteract the naturally warm, orange tones that DHA can produce.

When those colorants degrade — through age, oxidation, or chemical reaction — the balance shifts. The warmer tones break down first, leaving the cooler green tones behind. That’s where the green color comes from. Here’s what triggers each cause in more detail.

Cause 1: The Product Has Expired

The most common reason self tanner turns green is a simple one — it’s past its expiry date. Most self tanners have a shelf life of 6–12 months after opening, indicated by the PAO (period after opening) symbol on the packaging — a small open jar icon with a number inside (e.g. “6M” means 6 months).

As a product ages, the red and orange dye components in the guide colorant break down faster than the cooler tones. Over time, what remains is dominated by the green undertone that was originally there to neutralize warmth. That’s the green you see on the skin after application.

Expired product also means weakened DHA. Even if the green washes off successfully in the shower, the resulting tan may be significantly lighter than you expected. If your product has passed its PAO date, replacing it is the right move — it won’t perform the way a fresh bottle will.

Cause 2: Oxidation from Poor Storage

Even within its shelf life, self tanner can turn green if it’s been exposed to conditions that accelerate oxidation. Leaving the lid off the bottle, storing it in a warm bathroom, or leaving it in direct sunlight all introduce heat, oxygen, and light — all of which degrade both the DHA and the guide colorants faster than normal.

When you open the bottle and the product itself looks green rather than its original cream or bronze color, oxidation is almost certainly the cause. This is different from a reaction that happens on the skin — the product has already changed before it touches you.

The fix here is straightforward: dispose of the product. Oxidized self tanner won’t deliver a reliable tan and applying it risks uneven, off-color results even after the green guide layer washes off.

Cause 3: Deodorant or Perfume on the Skin

This is probably the most common cause of localized green patches — particularly under the arms — rather than all-over green. It’s also one of the most fixable once you understand why it happens.

Most deodorants are alkaline, with a pH of around 7–9. The skin’s natural surface pH is slightly acidic, sitting around 4.5–5.5. DHA’s Maillard reaction — the process that produces your tan color — is pH-sensitive. When an alkaline product like deodorant is still present on the skin during self tanner application, it disrupts the local pH environment. The DHA reaction shifts toward producing darker, greener-toned pigments rather than the expected warm brown, and the guide colorants in the formula react unpredictably with the alkaline residue at the same time.

The result is green patches specifically where the deodorant was applied. Perfume, certain lotions, and aerosol hairsprays can cause similar reactions. The fix is straightforward: wash these products off thoroughly before applying self tanner, every single time — even if you applied them hours earlier. Residue on the skin can still be enough to trigger the reaction.

Cause 4: Residual Lotion or Oily Products

Heavy moisturizers, body oils, and certain skincare products left on the skin can also interfere with self tanner. They create a barrier that disrupts how evenly DHA absorbs and reacts, and certain ingredient combinations can produce off-color results including green patches.

This is especially worth watching for on areas like the elbows, knees, and ankles where people often apply thicker moisturizers. Even if you’ve rinsed, a heavy body butter or oil-based lotion can leave enough residue to cause problems. Exfoliating and then rinsing skin thoroughly before application — without applying any leave-on products — is the best preparation routine. Our guide on how to exfoliate before tanning covers the full prep process worth following.

Cause 5: Erythrulose Degradation

Many self tanners contain erythrulose alongside DHA — a slower-acting sugar compound that extends the life of the tan and helps it develop more gradually. Erythrulose is more prone to oxidation than DHA and can turn yellow-green when it degrades. If your product contains both ingredients and has been stored improperly or is approaching its expiry, erythrulose breakdown can contribute to the greenish hue you’re seeing — both in the bottle and on the skin.

How to Fix Green Self Tanner Right Now

If It’s Still Wet on Your Skin

Don’t panic. The guide colorant layer — which is what’s causing the green — is still on the surface and hasn’t fully set. Get in the shower and rinse with warm water. Use a gentle body wash and wash the area thoroughly, paying attention to anywhere the product has pooled or gone particularly dark-green (often elbows, knees, or underarms).

The green from the guide colorant should rinse away. What remains underneath is the DHA reaction already starting on the skin — and provided the product isn’t expired or severely degraded, this should continue to develop into a normal-looking bronze tan over the next few hours.

If It’s Already Dried and Is Still Green After Showering

If a greenish tint remains after showering, the DHA itself has likely produced an off-color result — either because the product was expired, the pH on your skin was disrupted, or oxidization had affected the formula. At this stage, the options are:

Exfoliate — a gentle physical exfoliant used in the shower will help remove the outer layer of discolored skin cells faster than waiting for it to fade naturally
Try a tan remover — dedicated fake tan removers or a mixture of lemon juice and baking soda applied to the affected area can help break down the DHA color faster
Wait it out — DHA-based color typically fades significantly within 5–7 days as the skin naturally sheds. If the tint is mild, simply letting it fade naturally while staying moisturized is a reasonable option

The important thing to note is that a greenish DHA result after showering is rare — if your product is still within date and your skin was clean, the cosmetic guide color washing away should leave you with a normal tan developing underneath.

Will My Tan Still Work If the Tanner Is Green?

In the majority of cases, yes — as long as the product hasn’t fully expired or severely oxidized. The green guide colorant is cosmetic and washes off. The DHA underneath has been working on your skin since the moment of application and will continue to develop into a brown color regardless of what color the product looked when you put it on.

The caveat is expired product. If the product is past its use-by date, the DHA will have weakened along with the colorants — so even if the green rinses away cleanly, the resulting tan may be paler or more uneven than a fresh product would deliver. Don’t rely on an expired tanner if you need reliable results for an event.

Is It Safe to Use Green Self Tanner?

If the green is caused by a reaction with deodorant or perfume on the skin, the product itself is still fine and the reaction simply washes off. Safe to use on clean skin going forward.

If the product in the bottle is green due to oxidation or expiry, it’s generally better to discard it. Oxidized formulas can cause skin irritation in some people, and the results will be unpredictable regardless. A fresh bottle is always the better call.

How to Prevent Self Tanner Going Green

Check the Expiry Date Before Every Use

Get into the habit of checking the PAO symbol before you open a bottle. If it’s been 6+ months since you opened it, the product is approaching the end of its reliable window. When in doubt, check the color of the product in the bottle — fresh self tanner should be a creamy, beige, or light bronze shade. Green or olive coloring inside the bottle means it’s time to replace it. Our article on whether tanning lotions expire covers the full shelf life topic in detail.

Store Products Correctly

The ideal storage for self tanner is cool, dark, and dry — a bedroom cupboard or drawer works well. Avoid bathrooms where heat and steam from showers create exactly the conditions that accelerate oxidation. Always replace the lid tightly after every use to limit air exposure, and never leave a bottle somewhere it might be exposed to direct sunlight.

Prep Your Skin Thoroughly Before Every Application

This is the single most effective thing you can do to prevent green patches. Before every self tanning session:

Shower and wash off all deodorant, perfume, hairspray, and leave-on skincare
Exfoliate to remove dead skin cells that absorb unevenly
Pat skin completely dry and wait a few minutes before applying — moist skin can dilute and unevenly distribute the product
Do not apply any leave-on lotions, oils, or moisturizers before applying the tanner
Avoid applying to skin that still has makeup or other products on it

Moisturizing after your tan has developed is absolutely fine — and recommended — but the skin needs to be completely clean and dry at application time.

Frequently Asked Questions

Why is my self tanner green in patches but not all over?

Patchy green rather than all-over green almost always points to a skin prep issue rather than an expired or oxidized product. The most common culprit is deodorant residue under the arms, or perfume or lotion on specific areas of skin. The alkaline nature of these products disrupts the pH on the skin surface and causes DHA to react differently in those spots. Wash the patches off and focus on thorough skin prep before your next application.

Will my green tan turn brown after I shower?

In most cases, yes. The green color is predominantly in the guide colorant layer, which washes off with the shower. The DHA that’s already reacting with your skin cells will continue to develop into a brown color over the next few hours after you rinse. If the product is within its expiry date and wasn’t severely oxidized, the result should be a normal-looking tan.

How do I know if my self tanner has expired?

Check the PAO symbol on the packaging first — it’s the small open-jar icon with a number like “6M” or “12M” indicating months after opening. Signs that the product has gone off without that reference include the product looking green or olive in the bottle, a strongly unpleasant or unusual smell compared to when it was fresh, or a significantly changed texture. Most self tanners last 6–12 months after opening.

Can deodorant really make self tanner green?

Yes — this is one of the most well-documented causes of green patching. Deodorant is alkaline (pH 7–9), and when it remains on the skin during self tanner application it disrupts the pH-sensitive Maillard reaction that DHA undergoes. The result is an off-color pigment — typically green or dark olive — in the areas where the deodorant was applied. Always shower off deodorant before tanning, even if it was applied hours earlier.

What if my self tanner is still greenish after showering?

If the green doesn’t fully wash away, the DHA itself has likely produced an off-color result — usually from an expired product or a significant pH disruption. Exfoliating gently will help speed up the fade, as will a dedicated fake tan remover. A mixture of lemon juice and bicarb applied to the area is a commonly used home option. The color will fade naturally within a week as your skin sheds.

Is it safe to apply green self tanner to your skin?

If the green is happening on your skin as a reaction (clean product meeting skin that had deodorant or perfume on it), the product itself is safe. Rinse the reaction off and reapply to properly prepped skin. If the product itself is green inside the bottle due to expiry or oxidation, it’s better to discard it — oxidized formulas can occasionally cause irritation and the results will be unreliable regardless.

Why does self tanner turn green in the bottle?

When the product in the bottle itself is green, it has oxidized — either from repeated air exposure (loose lid), heat, light, or simply age. The guide colorants in the formula have degraded, with the warmer tones breaking down first and the greener tones remaining. This is a clear sign the product is past its useful life and should be replaced.

Conclusion

Green self tanner is almost always explained by one of a handful of causes — expiry, oxidation from poor storage, or a reaction with products on the skin. Understanding which cause you’re dealing with makes the fix straightforward in most cases.

If it’s a skin prep issue, wash it off, prep your skin properly, and reapply with a clean base. If the product in the bottle has turned green, it’s time for a new bottle. And if your tan has developed with a greenish hue that isn’t washing away cleanly, gentle exfoliation and a dedicated tan remover will speed up the fade.

The best way to avoid this entirely is a consistent routine: check your expiry dates, store products correctly with the lid sealed in a cool dark place, and always start with completely clean, product-free skin. Follow those three steps and green fake tan becomes a very rare problem. For more on getting self tanner application right from the start, check out our guides on fixing self tan streaks and why fake tan goes orange — both common issues with similar root causes.

References

DHA and the Self-Tanning Mechanism:
Petersen, A. B., et al. (2018). Journal of Cosmetic Dermatology. “Dihydroxyacetone, the Active Browning Ingredient in Sunless Tanning Products, Induces DNA Damage, Cell-Cycle Block and Apoptosis in Human Skin Cells.” Study confirming DHA’s mechanism of action in self-tanning — the Maillard reaction between DHA and amino acids in the stratum corneum — including how the reaction is influenced by the chemical environment on the skin’s surface.