Ringworm spreads through direct skin contact, shared personal items, and contaminated surfaces. Stopping it from spreading requires a combination of covering the infection, cleaning your environment, and keeping your hands and belongings away from others until treatment takes effect. The fungus is hardy and can survive on surfaces for months, so prevention takes consistent effort across several fronts.
How Ringworm Spreads
Despite the name, ringworm has nothing to do with worms. It’s a fungal infection of the skin that spreads three main ways: direct skin-to-skin contact with an infected person or animal, sharing items like towels, clothing, or bedding, and touching moist surfaces such as shower floors or locker room tiles. The fungus thrives in warm, damp environments, which is why gyms, pools, and shared bathrooms are common hotspots.
Ringworm of the nails spreads slightly differently. It typically enters through a small cut or break in the skin around the nail, which makes nail infections both harder to catch and harder to treat.
Keep the Infection Covered
The single most important thing you can do is keep the affected area covered with a clean, dry bandage whenever you’re around other people or shared surfaces. This creates a physical barrier between the fungus and everything it could touch. Change the bandage at least once a day or whenever it gets damp. Wash your hands thoroughly with soap and running water every time you touch the rash or change a bandage, even if you think you didn’t make direct contact.
Avoid scratching the area. Scratching can transfer fungal spores under your fingernails and then onto anything you touch afterward, including other parts of your own body. If the itch is hard to manage, an over-the-counter antifungal cream can help reduce it while also treating the infection.
When You Stop Being Contagious
Once you start antifungal treatment (topical or oral), the infection becomes significantly less contagious within a few days. Athletes are typically cleared to return to contact sports after 72 hours of consistent treatment, according to guidelines from Vanderbilt Children’s Hospital. That 72-hour benchmark is a useful general reference: after three days of proper treatment, the risk of spreading the fungus drops substantially.
That said, you should continue the full course of treatment even after symptoms improve. Stopping early is one of the most common reasons ringworm comes back or lingers long enough to spread to someone else.
Laundry That Touched the Infection
Anything that contacts the rash (towels, sheets, clothing, socks) needs to be handled carefully. Wash contaminated laundry separately from the rest of your household’s clothes. Don’t overfill the machine, because a packed washer can’t mechanically remove spores as effectively. Hot or cold water both work, and bleach isn’t necessary in the wash itself.
The dryer matters more than the washer here. Dry contaminated items separately on high heat, which helps kill remaining spores. Clean the lint filter after every load of ringworm laundry so spores don’t transfer to the next batch of clothes.
Cleaning Your Home
Fungal spores can survive on household surfaces for a long time, so regular cleaning is essential while anyone in the home is infected. Focus on surfaces the infected person touches frequently: bathroom counters, shower floors, doorknobs, and floors where they walk barefoot.
Diluted chlorine bleach is effective against the fungus. The CDC recommends a quarter cup of bleach per gallon of water for hard, non-porous surfaces. Strong detergents also work. Never mix bleach with other cleaning products. Vacuum carpeted areas and upholstered furniture regularly, especially spots where an infected person (or pet) spends time. Dispose of or clean the vacuum filter afterward.
Stop Sharing Personal Items
This sounds obvious, but it’s the rule people most often break without thinking about it. While the infection is active, do not share:
- Towels and washcloths, even between family members
- Clothing, especially hats, socks, and anything that touches skin directly
- Bedding and pillows
- Combs, brushes, and hair accessories (for scalp ringworm)
- Razors
Give the infected person their own dedicated set of these items and wash them after each use until the infection clears.
Gyms, Pools, and Locker Rooms
If you have an active infection, avoid using shared gym equipment, mats, or pool areas until you’ve been on treatment for at least 72 hours and can keep the rash fully covered. Wear flip-flops or shower shoes in locker rooms and communal showers, both to protect yourself from picking up new infections and to avoid leaving spores on wet floors.
Wipe down gym equipment before and after use. Shower promptly after workouts and dry off completely, paying extra attention to skin folds and areas between your toes. Sitting around in sweaty clothes creates the exact warm, moist environment the fungus loves.
If Your Pet Has Ringworm
Pets, especially cats and dogs, are a common source of ringworm in households. If your pet is diagnosed, take these steps to protect yourself and your family:
- Start veterinary treatment immediately. The faster the pet’s infection is managed, the shorter the window for spreading.
- Get other pets checked. Animals can carry the fungus without showing symptoms.
- Wear gloves and long sleeves when handling the infected pet.
- Wash your hands with soap and running water after every interaction with the pet.
- Vacuum frequently in areas where the pet spends time. Pet hair and skin flakes carry spores.
- Disinfect pet bedding and surfaces the animal contacts regularly.
Limiting the infected pet to certain rooms of the house can make cleaning manageable and reduce exposure for the rest of the household.
Daily Hygiene During an Active Infection
Shower daily, and consider using an antifungal body wash on and around the affected area. Products containing tolnaftate (a common over-the-counter antifungal ingredient) can help wash away fungal spores from the skin’s surface. Apply to wet skin, lather, and let it sit for one to two minutes before rinsing. This won’t replace your prescribed treatment, but it adds another layer of protection against spreading the fungus to other body parts.
Dry your skin thoroughly after bathing. Use a separate towel for the infected area if possible, and always dry the infected spot last so you don’t drag spores across clean skin. Put on fresh clothes daily, and opt for loose, breathable fabrics that reduce moisture buildup against the skin.