Swimming with active impetigo isn’t a good idea. The sores are highly contagious, and a pool puts lots of damp skin in close contact. The wait is usually short, often just a day or two once treatment has started. The bigger pool risk isn’t the chlorinated water itself but everything around it: shared towels, benches and kit.
Why Doctors Say Skip the Pool While Sores Are Active
Impetigo is a superficial bacterial skin infection, caused mainly by Staphylococcus aureus (staph) and Streptococcus pyogenes (strep).1F1000Research. A Novel Application of Pineapple Core Extract: In Vitro Antibacterial Activity Against Staphylococcus aureus and Streptococcus pyogenes from Impetigo Lesions The blistering type is almost always caused by staph alone.2PubMed Central. Impetigo – review The more common crusty type comes from staph, strep or both together.3PubMed Central. Impetigo – review It typically looks like red sores that ooze and form honey-coloured crusts, often around the nose and mouth.
Impetigo is one of the few skin conditions where skipping swimming until it clears is advised, because it is very contagious.4Just Swim. How does swimming affect common skin conditions Children’s hospital advice is that the bacteria can spread in pool water, so a child shouldn’t swim before treatment begins.5Royal Children’s Hospital Melbourne. Common questions about impetigo The bacteria thrive in warm, humid places, which is why swimmers face a higher risk.6English Dermatology. Impetigo – English Dermatology Sports health guidance says not to use pools, whirlpools or therapy pools until active infections and open wounds have healed.7Pennsylvania Department of Health. Skin Infections in Sports
Knowing what “active” looks like helps. Weeping or blistering sores are the most contagious stage, and a fresh yellow crust still counts as active. Dry, flat, fading skin with no new spots suggests healing, though timing on treatment matters too. If new spots keep appearing, the infection is still spreading. Waiting usually means missing a lesson or two, not a whole season.
Many parents ask whether a covered sore is fine to take into the water. A waterproof dressing is a backup, not a license to swim while sores are still weeping. Dressings often loosen once they are soaked, rubbed by a kickboard or pulled at by a child, and a loose edge lets fluid from the sore escape into the water and onto the people nearby. A dressing becomes useful later, once treatment has started and only a few dry sores remain, as an extra layer of protection.
It also helps to know whether the red patch is impetigo at all, since eczema, cold sores and bug bites don’t carry the same swimming advice. A dry eczema patch is typically scaly and itchy without a honey-coloured crust. Scratched bites and eczema can become infected with impetigo, so a rash that suddenly starts to weep or crust over should be checked rather than assumed to be the old problem. Only a doctor or nurse can confirm which it is, and a child who hasn’t been diagnosed should be seen before the swim lesson, not after.
When It’s Safe to Swim Again
Families will hear two timelines. Some children’s hospitals say a child can swim 24 hours after starting antibiotics.8Royal Children’s Hospital Melbourne. Common questions about impetigo UK health guidance says most people stop being contagious after 48 hours of treatment, or once the sores have dried and healed.9NHS inform. Impetigo Impetigo responds quickly to antibiotic tablets,10Just Swim. How does swimming affect common skin conditions so the wait is often short. If your doctor or local guidance gives a time, follow theirs; waiting the longer 48 hours is the cautious choice.
Without antibiotics the wait is longer. Some advice says not to swim until the skin has fully recovered.11Just Swim. How does swimming affect common skin conditions If sores are left untreated or are slow to heal, expect to wait until they are completely dry and gone. Keep taking the full course of treatment even once the sores look better.
The calendar is only a guide to when most people stop being contagious, so check the skin itself on the day of the swim. Look at every sore in good light: there should be no wet or oozing surface, no fresh blisters, and no new spots since treatment started. If anything is still weeping or new sores have appeared, the infection hasn’t responded yet. Postpone the swim, and call the doctor if it has been more than a couple of days.
Sores that look smaller can still be contagious. Schools and swim clubs may have their own rules, so check with them.
Does Chlorine Kill Impetigo Bacteria
Within 1 hour, a drug-resistant strain of staph was no longer alive in chlorinated, saltwater, or biguanide-treated pools.12PubMed. Survival of community-associated methicillin-resistant Staphylococcus aureus in 3 different swimming pool environments (chlorinated, saltwater, and biguanide nonchlorinated) So properly maintained pool water is unlikely to carry staph from one swimmer to another.13PubMed. Survival of community-associated methicillin-resistant Staphylococcus aureus in 3 different swimming pool environments (chlorinated, saltwater, and biguanide nonchlorinated) Bleach-based pool chlorine killed added bacteria within 10 to 30 minutes.14International Biodeterioration and Biodegradation. Comparative assessment of different biocides in swimming pool water A few hardy bacteria can survive even strong disinfection, though.15PubMed Central. Persistence of specialized bacteria during disinfectant challenge in a new swimming pool
Not every pool is well kept. Chlorine levels can drop in busy or neglected pools, and hot tubs and paddling pools are often harder to keep properly disinfected. Cloudy water can be a warning sign.
The danger lies in direct contact and shared items, which the water doesn’t treat. Chlorine can also irritate open wounds and slow their healing,16Dr. Wishnew. Wounds and Swimming and regular swimming in chlorine can disrupt the skin’s protective barrier.17Dermatology Experts. Poolside Living Destroys Skin Faster Than You Realize
A swim also doesn’t clean the sores. Chlorine acts on bacteria floating freely in the water, whereas the bacteria in impetigo sit in crusts and fluid in the sore, and the crust can even protect them.
How Impetigo Really Spreads at the Pool
You can catch impetigo when fluid from someone’s sore touches broken skin on yours.18UPMC | Life Changing Medicine. What Do Parents Need to Know About Impetigo? Scratching can carry it to other parts of your own body.19UPMC | Life Changing Medicine. What Do Parents Need to Know About Impetigo? Skin-to-skin contact passes on more bacteria than fabric does, and the transfer doesn’t weaken over repeated contacts.20PubMed. Fabric-skin models to assess infection transfer for impetigo contagiosa in a kindergarten scenario
Impetigo can also spread through towels, sheets and clothing.21UPMC | Life Changing Medicine. What Do Parents Need to Know About Impetigo? Staph can survive on cotton towels for more than 48 hours in amounts large enough to colonise skin,22PubMed. Staphylococcus aureus recovery from cotton towels and thicker, more absorbent towels may hold more of it.23PubMed. Staphylococcus aureus recovery from cotton towels Among competitive swimmers, leaving clothes on locker-room benches roughly doubled the odds of impetigo.24PubMed Central. Common Superficial Bacterial Skin Infections Self-Reported by 1047 Greek Competitive Swimmers: A 2021 Retrospective Study Sharing kickboards or flip-flops roughly doubled the odds too, and sharing fins was also linked.25PubMed Central. Common Superficial Bacterial Skin Infections Self-Reported by 1047 Greek Competitive Swimmers: A 2021 Retrospective Study A child who touches or scratches a sore, then grabs the pool kit, leaves bacteria behind. A towel left in a heap with others after a lesson can bridge children who never touched.
Young children are the most likely to catch it, since they are in close contact and share things. Anyone with cuts, scrapes or eczema is also at risk, since broken skin lets it in.
Impetigo usually needs a way in, such as a scratch, insect bite, cut or patch of eczema, which is why healthy-looking skin is less often infected than broken skin. Pool water softens the skin and chlorine dries and irritates it, so small cracks you can’t see may make it easier for bacteria to get in.
Keeping It From Spreading at the Pool
Bring fresh, clean towels and teach kids to grab their own.26Children’s Hospital of Philadelphia. Sneaky Summer Skin Infections You Can Pick Up at the Pool Don’t share towels.27Adventist Health. Skin Conditions You Can Get at the Pool Keep clothes and towels in a bag rather than on the benches, since leaving them out was linked to impetigo. Bring your own flip-flops and kickboard where possible. A named towel kept in a separate bag, waterproof plasters for cuts, and a wet bag for used kit all help.
In the changing room, use a bag with a hook or a locker so clothes and towels stay off the benches and the floor. Keep dry clothes in a separate compartment from the wet swimsuit and towel, so anything that touched a sore doesn’t touch clean clothes. If you need to sit on a bench, sit on your own towel, and put on flip-flops before walking on the floor.
Right after a lesson, rinse off in the shower and dry with the child’s own clean towel, drying any sore areas last so you don’t spread bacteria to clean skin. Put the damp towel and swimsuit straight into the wet bag rather than back into the main bag. Wash hands, the child’s and your own, before snacks are handed round.
At home, avoid picking at scabs and wash the skin with antibacterial soap.28Adventist Health. Skin Conditions You Can Get at the Pool Wash hands regularly, and wash towels and clothes at a high temperature.29Adventist Health. Skin Conditions You Can Get at the Pool If your doctor recommends a bleach bath, a soak of 20 to 30 minutes is followed by a plain-water rinse and then any prescribed cream.30Cincinnati Children’s Hospital Medical Center. Impetigo Treatment and Helpful Tips
Brothers, sisters and housemates need attention too. Give everyone separate towels while anyone has sores, wash bedding during treatment, and watch for new sores in others for several days.
Ocean and Lake Swimming With Sores or Cuts
Natural water isn’t a safer choice. Seas, lakes and rivers aren’t disinfected, and natural water contains many organisms, some able to cause infection if they get into a cut. After an ocean swim, bacteria from a group that includes some harmful species can stay on the skin for up to 24 hours.31PubMed Central. Alterations in the human skin microbiome after ocean water exposure People with open wounds, diabetes, liver disease or a weakened immune system face more severe sea-water infections.32PubMed. Skin and soft tissue infections following marine injuries and exposures in travelers
Lakes carry their own risks. Cuts picked up in fresh water have led to severe skin infections, even in healthy young adults.33PubMed. Freshwater Wound Infection Due to Aeromonas hydrophila Freshwater bacteria may not respond to the usual wound antibiotics,34PubMed. Wound infection due to fresh water contamination by Aeromonas hydrophila so tell your doctor if a wound picked up in a lake or river gets worse.
A waterproof dressing can keep out calm water on a small, clean cut for a short time, but it isn’t a guarantee. Waves, swimming strokes and sand can lift the edges, letting water in and trapping it against the wound. The safest choice is to stay out until it has healed. Water softens the skin, so a wound that has been in the water may be more open than before.
Signs It Needs a Doctor Again
Untreated impetigo can spread deeper into the skin, causing cellulitis or abscesses.35The Conversation. Why simple school sores often lead to heart and kidney disease in Indigenous children Very rarely, it is followed by a kidney problem or by rheumatic fever, which affects the heart, joints, brain and skin.36Centers for Disease Control and Prevention. Impetigo That’s a good reason to treat it promptly rather than waiting for it to clear by itself.
Watch for redness that spreads, or skin that feels warm and painful. Fever is another sign. In the weeks afterwards, dark or cola-coloured urine or puffy eyes need attention. So does no improvement after a few days of treatment. A parent can mark the edge of the redness with a pen and check whether it has moved, which gives the doctor something clear to go on.
If impetigo keeps coming back, ask the doctor about carrying the bacteria in the nose. Check the household for sores, and look at shared-kit habits at the pool.