Is a sauna good for acne? Sauna and steam

People sit in a sauna and come out with skin that feels soft and looks pink. It is easy to read that as the heat doing something to acne. The question that follows is the one people type into Google in many forms: does a sauna clear acne, does it cause acne, and is a steam room better.

Skinli's answer is short. No dermatology source read for this guide lists a sauna or a steam room as a treatment for acne. One controlled study measured real changes in the skin of regular sauna users. Those changes are worth knowing about, and they describe the surface of the skin rather than pimples.

What causes acne, and where heat sits

The American Academy of Dermatology describes acne as developing when pores become clogged, and says what type of acne you get depends on what clogs your pores. During puberty, hormones called androgens increase the size of the skin's oil glands, and those glands start making more oil, which can clog pores.

Heat, steam, sweat and humidity are not on that list of causes. They are also not on the list of treatments. This is the same pattern Skinli found when looking at hot showers and acne and at humidity and acne: the water temperature or the weather changes how skin feels and behaves, without being the thing that creates a pimple. If you want the full picture of what does cause acne, what causes acne covers it.

What a controlled study actually measured

There is one study worth describing properly, because it is the real evidence behind most sauna skin claims.

It was published in the journal Dermatology in 2008. The researchers compared 41 healthy volunteers aged 20 to 49. Some were regular Finnish sauna users and some had no regular sauna exposure. They measured both groups around a sauna session of 2 x 15 minutes at 80 degrees Celsius, using non-invasive tools.

In the regular sauna group they found:

What was measured	What they found in regular sauna users
Oil on the forehead	A decrease in casual skin sebum content on the skin surface
Barrier function	More stable epidermal barrier function
Water loss through skin	Faster recovery after it rose
Skin surface pH	Faster recovery after it rose
Water-holding capacity	An increase in the stratum corneum

The authors concluded that regular sauna appears to have a protective effect on skin physiology, especially surface pH and water-holding capacity.

Read that carefully, because the gap between it and "saunas clear acne" is wide. The study counted oil on the surface of the forehead and the condition of the outer layer of skin. It did not count pimples, it did not follow people with acne, and it did not test a sauna as a treatment. Less oil sitting on the surface is a different thing from fewer clogged pores underneath.

The bumps that are not acne

This is the part that changes what people should do.

Bumps that show up after a hot tub, a whirlpool or a heated pool may be folliculitis rather than acne. The AAD says you get folliculitis when you damage your hair follicles, and once damaged, it is easy for germs to get inside the follicles and cause an infection. It says that damage can happen while you are using a hot tub or whirlpool, and that most people see breakouts one to two days after using one.

Two of the conditions the AAD describes line up exactly with a sauna or steam room visit. It says that when your skin is damp and hot, it is easier to damage your hair follicles and get an infection. It also says tight clothing rubs against skin, and when it is hot and humid, the constant rubbing can injure hair follicles.

The AAD is direct about the confusion: infected hair follicles can look like another skin condition, such as acne, and a board-certified dermatologist can tell you whether you have folliculitis. Some people need medication, such as an antibiotic, to clear it.

A timing clue helps here. Acne does not usually appear one or two days after a single event and then settle. If bumps follow every visit to the same hot tub or pool on that schedule, that pattern is worth showing to a doctor. Skinli's guides on body acne or folliculitis and fungal acne go through how these look different, and benzoyl peroxide for folliculitis covers what is used on it.

What to do around a sauna or steam room

None of this is a reason to avoid heat you enjoy. It is a short list of sensible habits.

• Shower afterwards. The AAD advises showering soon after you sweat, and says showering immediately may rinse away bacteria that can cause acne.
• Use lukewarm water and a mild cleanser. Wash the face gently, in a circular motion, with a cleanser that does not clog pores.
• Pat dry, do not rub. The AAD warns against rough toweling after exercise, and says to gently pat sweat away. Dry, irritated skin risks more acne.
• Change out of damp clothing. Sitting in tight, wet clothing is the condition the AAD links to follicle damage.
• Skip the scrubs. The AAD names loofahs, back brushes and abrasive scrubs as things that can worsen acne, and says scrubbing skin with acne worsens it.
• Keep your treatment going. The AAD asks for 6 to 8 weeks on an acne product before deciding whether it works, and 3 to 4 months for clearing.

That last point is the one most worth holding on to. A sauna changes how your skin feels on the day. The thing that changes acne is a treatment used on the pore, steadily, for long enough to judge. If you are not sure what is on your skin or what stage your acne is at, you can check a photo of your skin and get a plan built around it.

See a doctor if the bumps are painful, deep or leaving marks, if they keep returning one or two days after the same pool or tub, or if your acne has not improved after a few months of steady care. Skinli gives education, and a dermatologist is the one who can tell folliculitis and acne apart by looking.