Close contact, shared mats, sweat and the occasional mat burn are part of training, but they can also create the perfect conditions for skin infections in BJJ and other contact sports. Knowing what to look out for helps you act early, protect your training partners and return to the mats responsibly.
This guide covers five common contact sports skin infections, their typical signs and the sensible next steps. It is not a diagnosis or a replacement for medical advice. If you notice a suspicious rash, sore, blister, boil or spreading area of redness, stop training and speak with a pharmacist or healthcare professional promptly.
Why skin infections spread in BJJ and contact sports
Grappling involves frequent skin-to-skin contact, friction and shared surfaces. Fungi, bacteria and viruses can spread through close contact, contaminated equipment or breaks in the skin. Freshly washed kit, clean mats, showering after training and covering cuts are simple habits that reduce risk, but they do not replace getting a potential infection checked.
1. Ringworm (Tinea corporis)
What it is: Despite the name, ringworm is a fungal infection, not a worm. It can appear as a red, circular, scaly and itchy patch with a raised edge. The look can vary from person to person, so do not rely on appearance alone.
Why it can spread: Ringworm spores can pass through direct skin contact and contaminated surfaces or items, including mats, towels and gis.
What to do: Stop close-contact training and seek advice from a pharmacist or clinician. Antifungal treatment may be recommended, but the right approach and when it is safe to return to training depend on the diagnosis and the rules of your gym or competition.
2. Athlete’s foot (Tinea pedis)
What it is: Athlete’s foot is another fungal infection, commonly affecting the skin between the toes. Signs may include scaling, cracking, soreness or itching.
Why it can spread: Damp changing rooms, communal showers and walking barefoot around shared training areas can all make it easier for fungi to spread.
What to do: Keep feet clean and thoroughly dry, particularly between the toes, and ask a pharmacist or clinician about suitable treatment. Avoid sharing towels, socks or footwear, and follow your gym’s policy if you have a suspected infection.
3. Staph and MRSA (Staphylococcus aureus)
What it is: Staph is a type of bacteria that can cause skin infections. It may present as a painful, warm, red or swollen bump, sometimes with drainage. MRSA is a strain of staph that can be more difficult to treat.
Why it can spread: Bacteria can enter through mat burns, cuts, shaved areas and small scrapes, then spread through close contact or shared surfaces.
What to do: Do not squeeze, lance or attempt to self-treat a suspected boil or abscess. Stop training, keep the area covered as advised and get medical assessment promptly. A clinician will decide whether prescription treatment or another intervention is needed.
4. Impetigo
What it is: Impetigo is a contagious bacterial skin infection. It often causes blisters or sores that burst and leave a distinctive golden or honey-coloured crust, commonly around the nose, mouth or other exposed skin.
Why it can spread: It is easily passed through skin contact and can take hold where the skin is broken or irritated.
What to do: Stop contact training and seek medical advice. Treatment may be topical or oral prescription medicine depending on the case. Avoid touching the area, keep nails short and do not share towels or kit.
5. Herpes gladiatorum (“mat herpes”)
What it is: Herpes gladiatorum is a skin infection caused by herpes simplex virus, often HSV-1. It can cause groups of painful, fluid-filled blisters, but symptoms can vary and may be mistaken for other conditions.
Why it can spread: Direct skin-to-skin friction during grappling makes transmission more likely, especially when an active lesion is present.
What to do: Stop training and arrange prompt medical advice. Antiviral medication may be considered by a clinician. Do not return to close-contact sport until a healthcare professional and your gym or governing body’s return-to-play guidance say it is appropriate.
How to help prevent BJJ skin infections
- Shower as soon as practical after every training session.
- Wash your gi, rash guard, shorts, towel and other training clothing after each use.
- Use clean, disinfected mats and do not train on mats that have not been properly cleaned.
- Cover cuts and mat burns before training, and keep them clean.
- Wear footwear off the mats, especially in changing rooms and showers.
- Do not share towels, razors, water bottles or unwashed kit.
- Tell your coach if you have a suspected infection, then sit out until you have appropriate clearance.
When to get help
Any painful, rapidly spreading, blistering, weeping or pus-filled skin change deserves prompt medical attention, particularly if you feel unwell or develop a fever. Early assessment is better for you, your teammates and your training room.
Smart BJJ hygiene is not about fear. It is about looking after yourself and the people you train with. Clean kit, clean mats and a no-ego approach to sitting out when something looks wrong are the habits that keep everyone rolling for longer.