Athlete’s foot is a fungal skin infection that causes itching, burning, and scaly or peeling skin on your feet, most often between the toes. It affects roughly 20% to 25% of adults at any given time, making it one of the most common skin infections worldwide. Here’s what it looks like, what it feels like, and what’s actually happening on your skin.
What Athlete’s Foot Looks Like
The appearance depends on the type you have and on your skin tone. Affected skin may look red, purple, or gray. In general, you’ll see scaly, peeling, or cracked skin, often starting in the space between your fourth and fifth toes. The skin there can become soft and waterlogged (doctors call this “macerated”), white, and prone to splitting open.
There are three main patterns:
- Interdigital (between the toes): The most common type. Peeling, cracking, and moist skin between the toes, sometimes with a mild odor. It often stays confined to one or two toe spaces at first, then spreads.
- Moccasin type: Affects the soles and sides of the feet in a pattern that looks like a moccasin. The skin becomes dry, thickened, and scaly, and may crack painfully along the heel. This type is easy to mistake for just dry skin.
- Vesicular (blister) type: The least common. Fluid-filled blisters appear suddenly, usually on the arch or instep. These can be both itchy and painful.
What It Feels Like
Itching and burning are the hallmark sensations, especially between the toes. The itching often gets worse after you take off shoes and socks, when the warm, trapped moisture has had hours to feed the fungus. With the moccasin type, the dominant feeling is tightness and dryness rather than intense itching, and deep cracks on the heel can sting sharply when you walk. The blister type adds a throbbing, tender quality, particularly if blisters break open.
What Causes It
A group of fungi called dermatophytes are responsible. The most common culprit worldwide is a species called Trichophyton rubrum. These fungi survive by feeding on keratin, the tough protein that makes up the outer layer of your skin, your nails, and your hair. They produce specialized enzymes that break down keratin, letting them burrow into the surface of your skin.
The infection stays shallow, confined to that outermost skin layer. But T. rubrum has a clever trick: its cell walls contain molecules that suppress your local immune response and slow down your skin’s natural turnover. Normally, your body pushes old skin cells to the surface and sheds them, which would help clear an infection. T. rubrum slows that process, allowing the fungus to settle in for the long haul. This is why athlete’s foot so often becomes chronic or keeps coming back.
How It Spreads
The fungus thrives in warm, damp environments. You pick it up by walking barefoot on contaminated surfaces like locker room floors, pool decks, shared showers, and hotel bathrooms. It can also spread through shared towels or shoes. Once on your foot, the fungus needs moisture and warmth to take hold, which is why it favors the tight spaces between toes where sweat gets trapped.
You can also spread it to other parts of your own body. Touching an infected foot and then touching your groin or hands can transfer the fungus. The same dermatophytes that cause athlete’s foot also cause jock itch and ringworm on other body parts.
Why It Matters If You Ignore It
Untreated athlete’s foot does more than itch. The cracked, broken skin between your toes creates an entry point for bacteria. This is one of the most common ways adults develop cellulitis, a potentially serious bacterial skin infection that causes spreading redness, warmth, swelling, and pain. Cellulitis typically requires antibiotics and, if left untreated itself, can lead to dangerous complications including bloodstream infections. Treating athlete’s foot promptly is one of the simplest ways to reduce your risk of cellulitis, especially if you have diabetes or circulation problems.
The fungus can also spread to your toenails, causing them to thicken, yellow, and crumble. Toenail fungal infections are much harder to treat than skin infections and can take months to resolve.
How to Treat It
Most cases respond to over-the-counter antifungal creams, ointments, or sprays. The most effective active ingredients fall into two main categories: terbinafine (and related compounds like butenafine and naftifine), and azole antifungals like clotrimazole and miconazole. Terbinafine-based products tend to work faster, often clearing mild infections in one to two weeks of daily application, while clotrimazole typically requires two to four weeks.
One important caution: avoid combination products that mix an antifungal with a steroid. These are sometimes prescribed or sold over the counter, but the CDC warns against them. The steroid component can actually worsen the fungal infection, extend treatment time, and promote resistance. If your skin is inflamed, it’s better to treat the fungus first and let the inflammation resolve on its own.
For stubborn or widespread infections, particularly the moccasin type, you may need prescription oral antifungal medication. These cases often require weeks or months of treatment. If over-the-counter creams haven’t improved things after two to four weeks, or if the infection is spreading, that’s a sign topical treatment alone isn’t enough.
Conditions That Look Similar
Dry, scaly feet aren’t always athlete’s foot. Psoriasis on the feet can look quite similar, especially to the moccasin type. A few differences help distinguish them. Psoriasis typically produces thicker, raised plaques and often appears on both feet symmetrically. It may come with deep, sometimes bleeding cracks, and you’ll usually have psoriasis somewhere else on your body too, or notice pitting and discoloration in your toenails. Athlete’s foot, by contrast, tends to start in one area and spread gradually, features more itching and burning, and improves with antifungal treatment. It’s also possible to have both conditions at the same time, since psoriasis may increase your susceptibility to fungal infections.
Contact dermatitis from shoes or socks can also mimic athlete’s foot. If antifungal treatment doesn’t help, the cause may not be fungal at all.
Keeping It From Coming Back
Because the fungus that causes athlete’s foot is everywhere and your feet are a perfect breeding ground, prevention comes down to reducing moisture. Keep your feet clean and dry, paying special attention to the spaces between your toes after showering. Change your socks at least once a day, more if your feet sweat heavily. Wear sandals or shower shoes in shared wet areas. Rotate your shoes so each pair has at least a day to dry out completely between wearings. Moisture-wicking socks made from synthetic blends or merino wool help more than cotton, which holds sweat against the skin.