Reviewed by Evan Lewis, PhD. Last updated 10 August 2026.
Your feet aren't supposed to itch, flake, or smell. When they do, and it keeps coming back no matter how well you wash them, it's usually fungus. Foot fungus is one of the most common skin conditions in the world, and it's almost always manageable once you understand what you're actually dealing with.
Here's what foot fungus is, how to tell if you have it, and what the evidence says about clearing it.
What Is Foot Fungus?
Foot fungus is a fungal infection of the skin on your feet, most commonly caused by a group of fungi called dermatophytes. The most familiar form is athlete's foot (tinea pedis), but foot fungus can also present as toenail fungus (onychomycosis), ringworm on the foot (tinea corporis), or a moccasin-type infection that covers the entire sole and heel.
It is extremely common. StatPearls puts tinea pedis at a level that may affect approximately 10% of the total population, and notes that risk rises with excessive sweating and with wearing occlusive shoes for extended periods.
Fungus thrives in warm, dark, moist environments, which is exactly what the inside of your shoe is. The space between toes is even better: low airflow, sweat accumulation, and skin-on-skin contact create the ideal breeding ground.
The infection is caused by the same type of organism responsible for jock itch and ringworm. These fungi live harmlessly on skin until conditions tip in their favor, usually when the skin's natural barrier is weakened, when feet stay damp for extended periods, or when you come into contact with fungal spores in a shared space.
What Does Foot Fungus Look Like?
Foot fungus doesn't always look the same. The type and location of the infection changes what you see.
Between the toes (the most common form): Skin looks white, peeling, cracked, or macerated (soft and waterlogged-looking). The area between the fourth and fifth toes is the most frequent starting point. Itching and burning are common.
On the soles and heels (moccasin-type): Dry, scaly skin that spreads across the bottom of the foot. Often mistaken for dry skin or eczema. Less itching than the between-toes version, but harder to address because the skin is thicker.
On the top of the foot (inflammatory type): Red, blistered patches that can weep fluid. More intense immune response. Can spread to the top of the foot or even the ankle.
On the nails (toenail fungus): When foot fungus spreads to the nail, the nail becomes yellow, thickened, brittle, or starts separating from the nail bed. This is a different stage of infection and it needs a longer routine. More on that below.
The key distinction between foot fungus and other conditions: fungal infections tend to be asymmetric (one foot worse than the other or starting on one side), they spread gradually over time, and they recur if the root cause isn't addressed.
What Causes Foot Fungus to Spread?
Understanding how foot fungus spreads is the fastest way to stop it from coming back.
Locker rooms and pool decks are the most common source. Fungal spores shed from infected skin survive on wet surfaces for hours. Shared shower floors, pool surrounds, and gym change rooms are all high-exposure zones.
Your own shoes and socks are the second most common source, and the one most people overlook. Once fungus establishes in your footwear, it reinfects your feet every time you put your shoes on. Washing your feet but not addressing your shoes is why infections keep returning.
Laundry is less reliable than people assume. When researchers washed dermatophyte-contaminated fabric, a 40°C wash left the spores viable and only 60°C removed them, and neither a week in the freezer nor a pass through a heat dryer finished the job.
Gym mats, yoga mats, and training floors are another vector, especially for barefoot sports. Martial arts gyms, yoga studios, and CrossFit boxes all see high rates of fungal transmission between members who train barefoot.
Prolonged moisture. Wearing damp shoes, sweaty socks left on too long, or going barefoot on wet floors without protection all give fungus the conditions it needs. Healthcare workers, athletes, and people in boots all day are at higher risk for this reason.
Sharing footwear, towels, or nail care tools transfers fungal spores directly. Pedicure equipment that hasn't been properly sterilized is a documented transmission route. So is simply living with someone who has it: a scoping review found transmission between household members in 44% to 47% of cases.
Which Home Remedies for Foot Fungus Have Evidence Behind Them?
Only a few, and the honest ranking is short. Most home remedies work by creating an inhospitable environment for fungal growth, through antifungal compounds, pH change, or direct antiseptic action. Here's what the evidence actually supports.
1. Aqueous iodine (the strongest evidence for topical daily use)
Iodine is a broad-spectrum antimicrobial that's been used in clinical settings for over 150 years. For daily use on the feet, aqueous iodine, a water-based non-staining formulation, is far more practical than traditional Betadine because it doesn't stain skin, doesn't sting, and can be applied consistently without disrupting skin integrity.
Published research describes iodine's activity against dermatophytes, including the organisms behind athlete's foot. Those are findings about the ingredient. Spray twice daily, morning and evening, on the skin and inside footwear. This is the routine used in 200+ foot care clinics across North America for daily maintenance.
2. Tea tree oil
One of the better-studied natural antifungals. Contains terpinen-4-ol, which disrupts fungal cell membranes. A double-blind trial in Australasian Journal of Dermatology found 25% and 50% concentrations of tea tree oil significantly effective against athlete's foot. Needs to be used consistently, twice daily for 4 to 6 weeks.
3. Hydrogen peroxide
Effective antifungal and antibacterial. Creates an oxygen-rich environment that fungus struggles to survive in. Works well as a soaking solution or spray. Downside: can be drying and irritating with frequent use, particularly on cracked or already-compromised skin.
4. Apple cider vinegar
Changes the pH of the skin's surface, making it less hospitable for fungal growth. Works best as a soak (one part ACV to two parts water for 15 to 20 minutes). Anecdotally popular and mildly supported by its acidic properties. Less potent than antifungal-specific options.
5. Baking soda (sodium bicarbonate)
Inhibits fungal growth by raising pH and absorbing moisture. Best used as a foot soak or foot powder rather than a topical paste. Particularly useful for the shoe environment, sprinkled inside shoes between wears.
6. Garlic
Contains allicin, which has demonstrated antifungal activity in lab settings. Practical application is limited. The smell, the skin irritation potential, and the need for direct skin contact make it less user-friendly than clinical-grade options.
7. Coconut oil
Contains caprylic acid and lauric acid, which have mild antifungal properties. Most useful as a moisture barrier and carrier for more potent antifungals (mixing with tea tree oil, for example) rather than as a standalone option.
When Does Foot Fungus Become Toenail Fungus?
This is the progression most people don't realize is happening until it's too late. Foot fungus and toenail fungus (onychomycosis) are related. Toenail fungus almost always starts as a skin infection that migrates under the nail through the nail bed or the skin around the nail edge.
Signs the infection has spread to the nail:
• The nail starts to look yellow, brown, or white in patches
• The nail thickens or becomes brittle
• The nail starts to lift away from the nail bed (onycholysis)
• The texture of the nail changes, ridged, crumbly, or powdery
Nails take longer than skin because the nail plate is a physical barrier, and because the nail only grows about 1.62mm a month, roughly half the fingernail rate people usually quote.
A great toenail is 20 to 25mm from base to tip, so a completely replaced nail is a 12 to 18 month project. Anything applied to a nail has to be applied daily across 90 or more days before there is even a band of new nail to look at.
The EZ Clear Nails 90-day routine is built around that timeline: a soak that carries solution under the free edge and around the nail folds where a brush cannot reach, plus a twice daily spray, repeated across three nail growth cycles to support the appearance of clearer looking nails.
The One Thing 200+ Clinics Recommend for Daily Foot Hygiene
The most consistent finding across foot care clinics that deal with fungal infections daily: staying ahead of it is almost always easier than catching up later. A review of shoe and sock sanitisation put recurrence and relapse rates for superficial fungal infections of the feet at 10% to 53%, which is why the footwear half of the routine is not optional.
The daily foot hygiene routine that clinic partners across North America consistently recommend:
1. Twice daily, morning and evening, after washing and drying feet, apply an iodine-based spray to the soles, between the toes, and to the insides of shoes and boots
2. Wear clean, dry socks, and change them mid-shift if feet sweat heavily
3. Never share footwear, towels, or nail tools
4. Allow shoes to dry fully between wears, alternating pairs if possible
5. Use a clean mat or sandals in shared shower areas
Sole Shield is designed to make this routine effortless: a quick spray on feet and inside footwear takes under 60 seconds. Soak. Spray. Repeat.
When Should You See A Foot Care Professional?
Get eyes on it if the skin is cracked open or weeping, if a nail is painful or lifting from the nail bed, if there is a dark streak running from the cuticle to the tip, or if you live with diabetes or poor circulation. Those situations want a professional look before any home routine.
FAQ
Q: How do I get rid of foot fungus fast?
Nothing on a foot is instant, and the honest lever is consistency rather than strength. A twice daily iodine step on skin and inside footwear, kept up every day, does more than an aggressive product used now and then. IodinePure Sole Shield is an aqueous iodine spray built for that kind of daily use: no alcohol, no sting, no staining on skin or socks, so the habit is actually sustainable. It is listed with Health Canada as a cosmetic.
Q: How do you get rid of foot fungus between your toes?
The gap between the toes stays damp and airless, which is exactly the environment fungus prefers. Dry the area properly after washing, then spray an aqueous iodine solution such as IodinePure Sole Shield directly between each toe, twice a day. Spraying the inside of your shoes matters just as much, because footwear is where the reinfection cycle lives. Change socks at least once a day and pick breathable fabrics where you can.
Q: What stops foot fungus from coming back?
Recurrence usually means the source was never dealt with: the shoes, a shared floor, or feet that stay damp. The routine used in 200+ foot care clinics across North America pairs a twice daily spray with soaks 3 to 4 times a week, soak, spray, repeat, and covers the inside of the footwear every time. Sole Shield is designed to make the spray step take under a minute so it actually gets done.
Q: Can foot fungus spread to your toenails?
Yes. Toenail fungus, onychomycosis, almost always begins as a skin infection that migrates under or around the nail edge. Yellowing, thickening and brittleness are the usual first signs. Once the nail is involved the timeline gets longer, because the nail plate is a barrier and toenails only grow around 1.62mm a month, roughly half the fingernail rate. IodinePure EZ Clear Nails is a 90-day kit built around a soak that reaches under the free edge and around the nail folds, used daily across three nail growth cycles to support the appearance of clearer looking nails.
Q: What is the best spray for foot fungus?
The one you will still be using in six weeks. That means non-staining, non-stinging, and suitable for daily use on skin and inside footwear. Aqueous iodine sprays such as IodinePure Sole Shield are used in 200+ foot care clinics across North America as a daily foot hygiene step, are made from two ingredients, iodine and pure water, and are listed with Health Canada as a cosmetic.
Q: What works fastest on foot fungus?
Nothing works instantly. Iodine and hydrogen peroxide act faster than most natural options. Prescription options such as clotrimazole and terbinafine are faster still, but even those need 2 to 4 weeks of daily use. The variable that actually moves the needle is consistency.
Q: Can foot fungus spread to other people?
Yes. Foot fungus is contagious through direct contact with infected skin or surfaces such as floors, shared towels and footwear. Avoid sharing towels and shoes, wear sandals in shared shower areas, and deal with your footwear as well as your feet.
Q: How long does foot fungus last if you ignore it?
It rarely resolves on its own. It typically persists, spreads across more of the foot, and can eventually reach the nails, where the timeline gets much longer. Acting early is always quicker than waiting.
Q: Is foot fungus the same as athlete's foot?
Athlete's foot is the most common type of foot fungus, specifically tinea pedis, usually between the toes. Foot fungus is the broader term that also covers moccasin-type infections of the sole and the early stages of toenail fungus.
Q: Does iodine help foot fungus?
Published research describes iodine as a broad-spectrum antimicrobial with activity against the dermatophyte fungi behind foot fungus. That is a finding about the ingredient. In practice, the aqueous water-based form is the one people can use every day, because it does not stain, does not sting and can go on skin and inside footwear without fuss. It is the form used in 200+ foot care clinics across North America for daily hygiene.
The Bottom Line
Foot fungus is common, persistent, and largely down to the environment it lives in. The mistake most people make is dealing with the symptoms and not the source: the shoes, the shared surfaces, the damp that lets it thrive.
The practical approach is twice daily application of aqueous iodine on skin and inside footwear, plus proper shoe hygiene and dry socks. Where the nails are involved, a 90-day routine gives new nail time to grow down and replace the older nail, on a timeline measured in many months rather than weeks.
Sole Shield is built for daily use on fungus-prone feet: spray the skin and the inside of your shoes after every wear. EZ Clear Nails is the 90-day soak and spray routine for fungus-prone nails, used daily across three nail growth cycles.
Try Sole Shield Daily Foot Spray Shop EZ Clear Nails 90-Day Kit
Evan Lewis, PhD, specializes in natural and nutritional therapies for the prevention and management of chronic diseases and their complications. His research spans chronic disease, diabetes complications, clinical nutrition, and nerve health, including the development of topical iodine for foot care and wound health. IodinePure products are listed with Health Canada as cosmetics.
