Published on · By GREATER
Skin infections in BJJ: how to prevent them and when to stop
Jiu jitsu means skin-to-skin contact, sweat and friction in every class, which makes it easier for some infections to spread: staph (including MRSA), ringworm, impetigo, herpes gladiatorum, molluscum contagiosum and scabies. Most can be avoided with simple habits and clear up well if treated early. This guide explains how they spread, how to prevent them and when to stop and see a doctor.
This guide is for information only and is not a substitute for a doctor. Don't try to diagnose yourself from photos: many skin lesions look alike and some can only be confirmed with tests.
Why BJJ makes infections easier to catch
The CDC (the US public health agency) notes that skin infections are most common in high-contact sports such as wrestling and rugby, and lists martial arts too. Three things play a part: direct contact during sparring, the small cuts and mat burns that let germs in, and shared items like towels, mats, benches or clothing.
The six most common infections
| Infection | Cause | What it usually looks like | How it spreads |
|---|---|---|---|
| Staph / MRSA | Bacteria (MRSA resists some antibiotics) | A red, swollen, warm, painful bump or wound, sometimes with pus; can look like a spider bite | Contact with skin or wounds, and shared items |
| Ringworm (tinea) | Fungi | An itchy, scaly, roundish patch; red on light skin, grey or brown on darker skin | Skin to skin, towels, locker room and shower floors |
| Impetigo | Bacteria | Sores or blisters that burst and leave golden crusts, often around the nose, mouth and hands | Skin to skin and towels or bedding |
| Herpes gladiatorum | Herpes simplex virus (the cold sore virus) | Clusters of small blisters on the face, neck or shoulders; may itch or tingle first | Direct contact with the lesions |
| Molluscum contagiosum | Virus | Small, firm, raised bumps, skin-coloured or pink, sometimes with a dimple in the centre | Direct contact and shared towels or clothing |
| Scabies | A mite | Intense itching, worse at night, with bumps and tracks on fingers, wrists or waist | Close, prolonged skin-to-skin contact |
The table helps you spot warning signs, not diagnose them. Whatever the new lesion, the answer is the same: don't train and get it checked by a professional.
Prevention: what each student can do
- Shower straight after training, at the academy if you can, not hours later at home. The NFHS (the US federation for high school sports) points out that waiting gives germs time.
- Clean gi, rashguard and towel for every class. Wash and fully dry them after each use; the CDC recommends a dryer over air drying.
- Don't share towels, clothing, razors, bar soap or creams from open tubs.
- Cover any cut or mat burn with a clean, dry bandage until it heals, and wash your hands after touching it.
- Flip-flops in showers and locker rooms, and never barefoot off the mats.
- Check your skin before class, especially hairy areas and where clothing rubs.
- Short, clean nails, which also prevent scratches.
- Wash your bag too, along with knee pads, mouthguard and ear guards.
Prevention: what the academy can do
- Clean and disinfect the mats before every session, with a suitable product and following its instructions. The CDC asks for facilities and shared equipment to be kept clean at all times, whether or not there have been cases.
- Soap in showers and sinks and bandages in the first aid kit.
- Clear, written rules: no shoes on the mats and no bare feet off them.
- Skin checks before class, as the NFHS does daily in wrestling, and ask anyone with an undiagnosed lesion to sit out that day.
- Let training partners know about a confirmed case, without naming anyone, so they can check themselves.
When to stop training
Stop training and book an appointment if you notice:
- A wound or bump that is painful, red, warm, swollen or has pus.
- Clustered blisters, yellowish crusts or a round, itchy patch that is growing.
- Strong itching that gets worse at night, especially if someone at home has it too.
- Any new lesion you can't identify.
Taping over it isn't enough in a contact sport: sparring moves bandages around. A clean, well-covered cut is a different matter and usually doesn't stop you training.
How long off the mats? Your doctor decides. As a reference, in US high school wrestling the NFHS asks for at least 3 days of treatment for skin ringworm (14 days of oral treatment if the scalp is involved), a minimum of 3 days of oral antibiotics for bacterial infections such as impetigo, and 10 to 14 days of antivirals for a first herpes outbreak or 120 hours for a recurrent one. According to the UK's NHS, impetigo stops being contagious 48 hours after starting the prescribed treatment.
When to see a doctor (and when it's urgent)
- Book an appointment for any suspicious lesion: the CDC notes that MRSA usually can't be confirmed without a lab test.
- Seek urgent care if you have a fever or chills, if redness spreads quickly or if the lesion is near the eye.
- Finish the treatment even if you feel better sooner, and don't return until your doctor says so.
- Scabies: the WHO advises treating the people you live with at the same time, even without symptoms, and washing clothes and bedding in hot water.
Frequently asked questions
Can I train jiu jitsu with a covered cut?
A clean cut that is well covered with a dry bandage usually doesn't stop you training. If the wound is red, warm, oozing or getting more painful, don't train and see a doctor.
How long should I stay off the mats with ringworm or herpes?
Your doctor decides. As a reference, the NFHS asks US high school wrestlers for at least 3 days of treatment for skin ringworm, 120 hours of antivirals for a recurrent herpes outbreak and 10 to 14 days for a first one.
Do I need to wash my gi after every session?
Yes. The CDC recommends washing and fully drying training clothes and towels after each use, ideally in a dryer rather than air drying, following the label.
Who decides when I can go back to training?
Your doctor. Neither your coach nor your training partners can diagnose a skin lesion: many look alike and some can only be confirmed with tests.
Sources: CDC · MRSA prevention for athletes · CDC · MRSA in athletic facilities · CDC · Ringworm · CDC · Molluscum contagiosum · WHO · Scabies · NHS · Impetigo · NFHS · Skin infections in wrestling (accessed 28 October 2026).