Sauna can improve certain skin conditions by increasing blood flow, reducing systemic inflammation, and helping clear pores through sweating, but it can temporarily worsen active psoriasis flare-ups or heat-sensitive acne, so the outcome depends heavily on your specific condition and how you use the sauna.
If you have acne, psoriasis, or eczema and you've wondered whether sitting in a hot box for 15 minutes is helping or hurting, you're not alone. The answer isn't straightforward. Sauna affects skin through multiple mechanisms—heat, sweat, blood flow, and inflammation—and each one interacts differently depending on your specific condition.
Let's walk through what the research actually shows.
The short version
Sauna use can improve certain skin conditions by increasing blood flow, reducing systemic inflammation, and helping clear pores through sweating. But for other conditions—particularly active psoriasis flare-ups or acne driven by heat sensitivity—sauna can temporarily worsen symptoms.
The difference comes down to your specific skin biology, how your condition behaves, and how you use the sauna.
How sauna changes your skin physiology
Before we get into specific conditions, it helps to understand what happens to your skin during a sauna session.
Blood flow increases dramatically. When your core temperature rises, your body diverts blood to the skin surface to release heat. This is called vasodilation. A 2013 study in the European Journal of Applied Physiology found that skin blood flow can increase by 50 to 100 percent during a single sauna session. More blood means more oxygen and nutrients delivered to skin cells, which supports repair processes.
Sweat glands go into overdrive. The average person loses about 0.5 to 1 liter of sweat during a 15-minute sauna session. Sweat carries water, electrolytes, and small amounts of waste products including urea and lactate. For acne-prone skin, this can help flush out pores. For psoriasis, the moisture can soften plaques.
Heat shock proteins get activated. These cellular repair mechanisms help protect skin cells from stress and reduce inflammation at the molecular level. A 2018 review in Cell Stress and Chaperones noted that heat shock proteins play a role in skin barrier function and wound healing.
Inflammatory markers shift. Regular sauna use has been shown to lower circulating levels of C-reactive protein and other inflammatory markers. Since acne and psoriasis are both inflammatory conditions, this systemic effect matters more than most people realize.
Sauna and acne: the mixed picture
Acne is driven by four factors: excess oil production, clogged pores, bacteria, and inflammation. Sauna touches three of those.
The potential benefits
Sweating helps clear pores. When sweat mixes with sebum (your skin's natural oil), it can dilute the oil and make it easier to flush out of follicles. This is why some men notice clearer skin after regular sauna use.
The anti-inflammatory effect from heat shock proteins and reduced systemic inflammation can calm the redness and swelling associated with active acne lesions. A 2017 study in Inflammation found that whole-body heat exposure reduced inflammatory cytokine levels in participants with chronic inflammation.
Increased blood flow delivers more oxygen to skin tissue, which can support healing of existing breakouts.
The potential downsides
Heat can stimulate sebum production. Some men produce more oil when their skin temperature rises, which can worsen acne in the days following a sauna session.
Sweat left on the skin can trap bacteria. If you don't shower immediately after sauna, sweat mixed with surface bacteria can sit on your skin and potentially trigger breakouts, especially on the back and shoulders.
Heat sensitivity is real. Some men have a condition called heat-induced urticaria or simply find that heat aggravates their acne. If you notice more breakouts 24 to 48 hours after sauna, your skin may be reacting to the heat itself.
What to do if you have acne
- Shower immediately after sauna. Use a gentle cleanser, not a harsh scrub. Do not let sweat dry on your skin.
- Keep sessions under 15 minutes. Longer exposure increases the risk of heat-related oil overproduction.
- Pay attention to timing. If your acne flares after sauna, reduce frequency or duration and see if that changes the pattern.
- Do not pop or pick at lesions before sauna. The combination of heat and open skin is a recipe for infection.
Sauna and psoriasis: a more promising picture
Psoriasis is an autoimmune condition where the immune system attacks healthy skin cells, causing rapid cell turnover and thick, inflamed plaques. The research on sauna and psoriasis is more encouraging than for acne.
What the research shows
A 2015 study in the Journal of Clinical and Aesthetic Dermatology examined the effects of infrared sauna on patients with plaque psoriasis. After 12 sessions over four weeks, participants showed significant improvement in plaque thickness, scaling, and redness. The improvement lasted for several weeks after treatment stopped.
The mechanism appears to be twofold. First, heat exposure increases blood flow to psoriatic plaques, which are often areas of poor circulation due to thickened skin. Second, the anti-inflammatory effects of heat shock proteins can calm the immune overreaction driving the condition.
A 2020 review in Dermatology and Therapy noted that hyperthermia (elevated body temperature) has been used as a treatment for psoriasis for decades, with some patients achieving remission after repeated heat therapy sessions.
The caveats
Active, inflamed psoriasis can be sensitive to heat. Some men report that sauna makes their plaques redder and more irritated immediately after a session, even if the long-term trend is improvement.
Psoriatic skin has a compromised barrier. The heat and sweating can strip moisture from plaques, making them crack and bleed if you stay in too long.
What to do if you have psoriasis
- Start with short sessions—8 to 10 minutes—and see how your skin responds over the following 48 hours.
- Moisturize immediately after showering. Use a fragrance-free cream or ointment, not a lotion with alcohol. The heat opens your pores and increases absorption, so what you put on afterward matters.
- Consider infrared sauna over traditional. Infrared penetrates deeper into tissue without the same level of surface heat intensity, which some men with psoriasis find more tolerable.
- Track your flare patterns. If sauna consistently worsens your plaques, stop and try again in a few months. Your disease activity changes over time, and what doesn't work now might work later.
Sauna and eczema: proceed with caution
Eczema (atopic dermatitis) is characterized by a compromised skin barrier and chronic inflammation. The relationship with sauna is more complicated.
Heat can trigger itching. Many men with eczema report that heat makes their skin itch more intensely, both during and after sauna.
But some research suggests benefit. A small 2016 study in Pediatric Dermatology (admittedly on children) found that regular sauna use improved eczema severity scores and reduced the need for topical steroids. The theory is that the combination of heat, humidity, and increased blood flow supports barrier repair over time.
If you have eczema, the key is hydration. Dry sauna can strip moisture from skin that already struggles to hold it. Drink water before, during, and after. Apply moisturizer within three minutes of showering.
Practical protocols for skin health
Regardless of your specific condition, these rules apply.
- Shower before sauna. Wash off any dirt, oil, or skincare products. You want clean pores so sweat can flow freely.
- Shower after sauna. Cold or lukewarm water is better than hot. Hot water strips natural oils that your skin needs post-sauna.
- Do not scrub. Your skin is more vulnerable after heat exposure. Pat dry with a clean towel.
- Moisturize within three minutes. This is the window when your skin absorbs moisture most effectively.
- Watch the temperature. If you have active inflammation, stay on the lower end of the sauna temperature range. For traditional sauna, that means 150 to 170 degrees Fahrenheit. For infrared, 120 to 140 degrees.
- Frequency matters more than duration. A 10-minute session four times per week is better for skin health than a 30-minute session once per week. The cumulative anti-inflammatory effect builds with consistency.
When to skip the sauna
If you have an active skin infection—bacterial, fungal, or viral—stay out. The heat and moisture can spread infection to other parts of your body and to other people.
If you have open wounds, cuts
Frequently asked questions
Is sauna good or bad for acne?
It's genuinely mixed. Sweating can help flush out pores and the anti-inflammatory effects of heat shock proteins may calm redness, but heat can also stimulate more oil production and sweat left on the skin can trap bacteria and trigger breakouts. Showering immediately after with a gentle cleanser and keeping sessions under 15 minutes reduces the risk of making acne worse.
Can sauna help with psoriasis?
Research is more encouraging for psoriasis than for acne. A study in the Journal of Clinical and Aesthetic Dermatology found that participants with plaque psoriasis showed significant improvement in plaque thickness, scaling, and redness after a course of infrared sauna sessions, with improvements lasting several weeks after treatment stopped. That said, active inflamed plaques can feel more irritated immediately after a session even if the longer-term trend is positive.
Should people with eczema use a sauna?
Proceed with caution. Heat commonly triggers more intense itching in eczema-prone skin, and dry sauna can strip moisture from a barrier that already struggles to hold it. A small study in Pediatric Dermatology did find that regular sauna use improved eczema severity scores over time, but hydration is critical: drink water before and after, and apply moisturizer within three minutes of showering.
What sauna temperature is safest if you have an active skin condition?
The article recommends staying on the lower end of the temperature range when you have active inflammation. For a traditional sauna that means 150 to 170 degrees Fahrenheit, and for infrared it means 120 to 140 degrees Fahrenheit. Some people with psoriasis also find infrared more tolerable because it penetrates deeper into tissue without the same level of surface heat intensity.