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Skin infections in jiu-jitsu, and when to stay off the mat
What actually stops you catching ringworm or staph at training, and how long to stay off the mat once you have something.
The short version: shower straight after training, wear sandals off the mat, wash your gi every session, and keep your nails short. Those are the basics. But the thing with the best evidence behind it is not a product at all, it is someone checking skin before training starts, and what most people get wrong is going back too early, or taping over a patch and rolling anyway. Wrestling publishes exact rules for when you can return. Jiu-jitsu does not, so this post borrows them.
It is worth knowing who writes most of the advice you will find on this. Search for how to avoid ringworm in jiu-jitsu and the results are largely published by companies that sell body wash, wipes, soap bars and shower sandals, alongside gyms writing about their own cleaning routine. The best-ranked guide we read ran to nearly 1,800 words, cited no medical source of any kind, and linked the author's own products throughout. None of that makes the advice wrong. It does explain why almost all of it is about things you can buy, and why almost none of it tells you the two things that matter most.
The thing with the best evidence is not soap
High school wrestling in the United States requires a skin inspection before every competition. Someone qualified looks at every wrestler, and anyone with a patch that looks wrong does not compete.
A study of 510 wrestlers across 17 Minnesota schools tracked ringworm through a twelve-week season and found it in 4.3% of them. The authors compared that with about 24% reported before the checks came in, and put the difference down to the inspections, because pulling one wrestler out before the match stops it going any further.
That is roughly a fivefold difference, and it comes from looking rather than from washing.
Jiu-jitsu has no equivalent. There is no screening, no requirement, and in most gyms no habit of it either. Which means the practical version for you is to do it yourself: look at your own skin before you train, and if you find something you cannot explain, stay off the mat until you know what it is. If you train somewhere that would notice and say something, that is a good sign about the gym.
What actually works, roughly in order
The basics are worth doing. They are just not equally valuable, and the usual lists present them as though they are.
Do not train with something on your skin you cannot explain. This is the whole thing, and it costs nothing. Most of it spreads because somebody trained when they should not have, usually because they were not sure what it was and did not want to miss a session.
Shower promptly after training, ideally at the gym rather than after a drive home. Sooner is better than later, and it is one of the few individual measures that consistently appears in prevention guidance.
Wear sandals any time you are off the mat, especially in changing rooms and to the toilet, and never walk back onto the mat barefoot from outside. This is about what gets carried onto the mat as much as what you pick up from it.
Wash your gi or rashguard after every single session. Not airing it, washing it. This is also the practical argument for owning two, which we mentioned in what actually happens in a first jiu-jitsu class.
Cover broken skin before you train, properly, and keep nails short so you are not the one breaking someone else's.
The gym's own habits matter too, and they are visible if you look. Are the mats cleaned between sessions rather than at the end of the week, are there showers that people actually use, and does anybody say anything when someone turns up with a patch on their arm. If you are still choosing where to train, that is one of the things worth looking at on a visit, which we covered in how to choose between two gyms. Our directory lists gyms with their timetables where they publish one, so you can line up a couple to go and see.
When to stay off the mat
This is the part nobody in jiu-jitsu publishes, and it is the part people most need.
Wrestling's national federation sets out exactly when a wrestler can go back, in its position statement on sports-related skin infections. They apply once a doctor has told you what you have, and they are the clearest numbers a grappler can go by, because our sport has published nothing of its own.
| What the doctor says you have | Before you go back to contact |
|---|---|
| Staph or another bacterial infection, MRSA included | 3 days of treatment, and no more weeping |
| Ringworm on the body or groin | 3 days of antifungal cream |
| Ringworm on the scalp | 2 weeks of antifungal tablets |
| Mat herpes, first time | 10 days of treatment, or 14 if you also feel ill with it |
| Mat herpes, a flare-up | 5 days on antivirals, everything scabbed over, and no new blisters for 3 days |
Two of those catch people out. Ringworm on your scalp needs two weeks of tablets, not a few days of cream, which is exactly why it goes round a gym when someone treats it like the ordinary kind. And the herpes numbers are far stricter than most people assume, because it is the one that moves fastest on a mat.
Whether your gym enforces anything is beside the point. These are the numbers to hold yourself to.
Taping over it does not work
The most common mistake by a distance is covering something up and training anyway, on the basis that if it is under a rashguard it cannot reach anybody.
That is not how it works. A dressing is for something that has already stopped being catching, meaning a proper scab that is staying put, with nothing weeping out of it. It is a second layer on top of treatment, not a way round it. On mat herpes the federation is blunter still: no dressing is good enough, and the skin has to be fully healed before you go back.
So a patch of something you cannot explain, taped over, under a rashguard, on a Tuesday night, is not under control. It is how one person's two weeks off turns into six people's two weeks off.
If you think you have something
Stay off the mat, message your coach, and get it looked at by a doctor or a pharmacist rather than matching it against photographs online. Bacterial, fungal and viral infections look far more alike than you would want, they need completely different treatment, and what you have is what decides how long you are off. Guessing wrong in either direction costs you: treat a fungal infection as bacterial and it persists, sit out unnecessarily and you lose weeks for nothing.
Telling your gym early is worth doing and it is not embarrassing. Every long-standing grappler has had something at some point, and the people who are remembered badly are not the ones who caught something, they are the ones who trained through it.
The bigger picture is that this is manageable and it should not put you off the sport. A few habits and one honest look at your own skin before you train handles most of it, and the sport's real attrition problem is people quietly drifting away rather than anything they picked up on the mat, which we went into in why white belts quit.
This post summarises published guidance and research and is not medical advice. Get anything on your skin looked at properly.