Does a Sauna Make You Tan? No – and Why You Look Bronzed

Short answer

No. A sauna cannot tan you: it gives off heat, not UV, and UV is what triggers the extra melanin of a tan. A pink or bronzed look is often flushing from widened blood vessels and should fade as you cool down. Repeated close heat can leave lasting marks, so a patch that stays red, brown or mottled needs a doctor’s check.

Skin can look different after a sauna, but appearance alone cannot identify the cause or show that a change is harmless. Here is what you are seeing, the one heat-related skin change worth knowing, and how saunas fit with sunbeds and self-tan.

Table of Contents

Why a sauna cannot tan you

Skin colour comes from melanin. According to Cleveland Clinic, your body makes more melanin when you are out in the sun, and the UV in sunlight drives that response; the extra pigment is a tan. No UV, no tan.

A traditional sauna heats the air with a stove and hot stones. An infrared sauna uses panels that emit infrared, felt as heat; Cleveland Clinic puts these cabins at about 110 to 135 °F (43 to 57 °C), against 150 to 195 °F (66 to 91 °C) for a traditional sauna. Infrared and UV sit on opposite sides of visible light, and heat alone does not trigger tanning.

Heat, UV and self-tan compared
Source	UV exposure	Does it tan?	What you see
Sun	Yes	Yes, after 1–2 days	Tan, freckles or sunburn – UV also damages skin
Sunbed	Yes	Yes	Tan – with the same UV risks as the sun
Traditional or steam sauna	No	No	Possible heat flushing; persistent changes need assessment
Infrared sauna	No (heat panels)	No	Possible heat flushing; repeated heat can also alter pigmentation
Self-tanner / spray tan	No	Cosmetic colour, no melanin	Colour develops over hours and fades over days

Some cabins add coloured LEDs or red-light panels. These are visible or near-infrared light, not tanning lamps; if a device has an extra lamp you are unsure about, check that model’s specification. See what infrared sauna colours mean.

What the “sauna glow” actually is

Heat widens the small blood vessels in your skin so your body can shed heat. DermNet explains that flushing is exactly this dilation, often with sweating. More warm blood near the surface makes skin look pink, red or bronzed, especially on the face, chest and shoulders.

The flush is circulation, not pigment, so it does not build up over sessions and fades as you cool down. It is not a sign of “detoxed” skin, just temperature control.

When colour after heat is not just a flush

DermNet describes erythema ab igne (“toasted skin”), a reaction to chronic heat exposure, classically from sitting close to fires or heaters. It starts as a net-like red pattern and, with repeated exposure, can leave patches darker or lighter than the surrounding skin.

The risk comes from the same patch of skin being heated again and again at close range, for example always sitting with your back near an infrared panel or the heater.

Keep distance from panels and the heater, and vary your position.
Do not repeatedly heat one area on purpose.
If a patch stays red, brown or mottled after cooling, stop heating it and have it checked by a doctor.
A sore that does not heal or a growing lump in such a rash needs prompt medical assessment; DermNet advises a biopsy to rule out skin cancer.

Colour alone cannot show whether a change is harmless. See also does a sauna make your skin lighter or darker and can an infrared sauna burn your skin.

Man in a sauna seen through a glass door

Sauna and sunbeds: no “safe tanning” routine

A sauna before a sunbed does not make tanning faster or safer; the order does not change the UV dose. The NHS says there is no safe or healthy way to get a tan, the American Academy of Dermatology says tanning beds are not safer than the sun, and the FDA calls a tan a sign of skin damage.

Our sauna before or after tanning guide covers timing if you do both, but nothing makes UV tanning safe.

Sauna with a self-tan or spray tan

For colour without UV, the AAD suggests self-tanner, still with sunscreen. The issue is sweat while it develops: DermNet says colour from DHA, the active ingredient, starts after about an hour and peaks after 8 to 24 hours.

Right after application: the AAD advises loose clothing and no sweating for about three hours, so skip the sauna.
Spray tans and express formulas: times differ by product. Follow the label or salon aftercare; the first rinse is not an automatic all-clear for heat.
Later on: sweating, hot showers and towelling shed the outer skin cells that hold the colour, so frequent sessions fade a self-tan sooner. Pat dry and moisturise.

Looking after your skin in the sauna

Drink water before and after; see how much water to drink in the sauna.
Shower afterwards and moisturise if your skin feels dry; see is sauna good for skin.
Leave if you feel dizzy or unwell; the NHS lists the signs of heat exhaustion. General timings: how long to use a sauna.
Pregnant, a heart or blood-pressure condition, or skin that flares with heat (such as rosacea)? Ask your doctor first.

FAQ: Does a sauna make you tan?

Does a sauna make you tan?

Sauna heat is not a UV-tanning method. A colour change afterwards may be flushing, but persistent or unusual changes should be assessed by a doctor.

Why do I look tan after a sauna?

Flushing can change how your skin looks because blood vessels widen. Colour alone cannot distinguish flushing from pigment changes or other skin conditions.

Can you get a tan in an infrared sauna?

No. Infrared panels produce heat, not UV. Coloured LED or red-light features are not tanning lamps; check the model’s specification if unsure.

Can regular sauna use darken my skin over time?

Repeated heat exposure can cause erythema ab igne, which may leave persistent changes in pigmentation. This is not a UV tan. Avoid heating the affected area and have a lasting patch assessed.

Does a sauna before a sunbed help you tan faster or more safely?

No. The order does not change the UV dose. The NHS says there is no safe or healthy way to get a tan.

Can I use a sauna after a self-tan or spray tan?

Wait until it has developed and follow the product or salon instructions. The AAD advises no sweating for about three hours after applying self-tanner; sweat can streak a developing tan.

Sources

Reviewed 18 October 2026. General information, not a diagnosis or personalised medical advice.