Pink sweat is almost always caused by something reacting with your sweat on the skin’s surface, not by a problem with the sweat itself. The most common explanation is a type of bacteria called Serratia marcescens, which produces a pink-red pigment when it mixes with sweat under the right conditions. Less commonly, clothing dyes, chemicals, or certain medications can turn sweat pink. In rare cases, your sweat glands themselves produce colored sweat due to a condition called chromhidrosis.
Bacteria on Your Skin: The Most Likely Cause
The most common reason for pink sweat is a condition called pseudochromhidrosis. Your sweat comes out clear and normal, but something on your skin’s surface reacts with it to create color. When bacteria are responsible, the culprit behind pink or red discoloration is typically Serratia marcescens, a bacterium that releases a red pigment called prodigiosin when specific temperature and pH conditions are met.
You might not notice the color on your skin at all. Many people first spot it on white towels, bedsheets, or light-colored clothing after sweating. The pink staining can look alarming, but the bacteria itself isn’t considered dangerous on intact skin. Other chromogenic bacteria can cause different colors: Corynebacterium species produce brown or black, Pseudomonas aeruginosa causes blue or green, and Bacillus species can create blue discoloration.
If bacteria are behind your pink sweat, improving hygiene in the affected area and using an antibacterial wash will usually resolve it. The key giveaway is that the color appears where sweat meets skin or fabric, rather than coming directly out of the gland.
Dyes, Chemicals, and Clothing
Pseudochromhidrosis can also be triggered by non-bacterial sources. Dyes from new clothing, particularly red or pink fabrics that haven’t been washed, can dissolve into sweat and leave a pinkish residue on your skin. Chemicals and metals that contact the skin can do the same thing. If you recently started wearing a new garment, changed laundry detergent, or used a new product on your skin, that’s worth investigating before assuming a medical cause.
The fix here is straightforward: wash new clothes before wearing them, and eliminate any product you suspect might be transferring color. If the pink sweat disappears, you have your answer.
Medications That Change Sweat Color
Certain medications are well known for discoloring body fluids, including sweat. Rifampin and rifapentine, antibiotics used to treat tuberculosis, turn sweat, urine, and tears orange to reddish-orange. The CDC considers this a normal, minor side effect and advises patients to expect it for the entire duration of treatment. The discoloration stops when the medication is discontinued. If you’re taking either of these drugs and noticing pinkish or orange-tinged sweat, that’s almost certainly the explanation.
Other medications and supplements can occasionally tint sweat as well. If the timing of your pink sweat lines up with starting a new prescription or supplement, check with your pharmacist.
Chromhidrosis: When the Sweat Itself Is Colored
True chromhidrosis is rare. In this condition, the sweat glands themselves produce pigmented sweat before it ever reaches the skin surface. The color comes from lipofuscin, a pigment granule found inside apocrine sweat glands (the type concentrated in your armpits, groin, and face). Everyone’s apocrine glands contain some lipofuscin, but people with chromhidrosis either have more of it or their lipofuscin is in a higher state of oxidation.
The degree of oxidation determines the color. More oxidized lipofuscin tends to produce darker shades: yellow, green, blue, brown, or black. Pink falls on the lighter end of this spectrum. Because apocrine glands are involved, chromhidrosis typically affects the armpits, face, and groin rather than the whole body.
Treatment for chromhidrosis can be tricky. Topical options include aluminum chloride solutions and capsaicin cream, though some patients tolerate these poorly. Botulinum toxin injections have shown promise as an alternative, with one published case demonstrating successful control of facial chromhidrosis lasting at least 19 weeks after treatment. Since the condition tends to recur, treatment is usually ongoing rather than a one-time fix.
Pink Sweat vs. Sweating Blood
If your sweat looks pink, you might worry it contains blood. Hematidrosis, a condition where blood seeps through sweat glands, does exist but is extraordinarily rare, with only a handful of confirmed cases in medical literature. It’s typically associated with extreme physical or emotional stress and looks distinctly like blood rather than evenly tinted pink sweat. If your sweat is a uniform pink color rather than streaked with red, hematidrosis is very unlikely.
Figuring Out Your Cause
Start with the simplest explanations. Think about whether you’ve changed clothing, started a new medication, or noticed the color only on towels and fabric rather than directly on your skin. Try washing the affected area with antibacterial soap before exercise or heavy sweating, and see if the pink color disappears over the next few days.
If the discoloration persists despite ruling out external causes, a dermatologist can help. One diagnostic tool they may use is a Wood’s lamp, a type of ultraviolet light that causes certain pigments to fluoresce, helping distinguish between pseudochromhidrosis (external cause) and true chromhidrosis (internal cause). A skin swab can also identify whether chromogenic bacteria like Serratia marcescens are present.
Pink sweat is cosmetically annoying and understandably alarming, but it’s rarely a sign of something dangerous. Most cases resolve once the external trigger is identified and removed.