Foot fungus typically shows up as scaly, peeling, or cracked skin between the toes, but it can also appear as dry scaling across the sole, fluid-filled blisters on the arch, or discolored, thickened toenails. The exact look depends on which type of fungal infection you have and where it takes hold. About 3% of the world’s population has some form of foot fungus at any given time, making it one of the most common skin infections.
Between the Toes: The Most Common Type
The form most people picture when they think of athlete’s foot starts in the spaces between the toes, usually the fourth and fifth (the two smallest). Early on, the skin looks white and soft, almost waterlogged. This soggy, macerated texture happens because moisture gets trapped in the tight space between toes, creating the perfect environment for fungus to grow.
As the infection progresses, you’ll notice peeling and flaking skin that pulls away in thin sheets. The skin underneath may look pink or raw. Fissures, which are small cracks in the skin, can develop in the crease of the toe web. These cracks sometimes sting or burn, especially when sweat or water hits them. On darker skin tones, the affected area may appear grayish or purple rather than red. Itching is usually worst right after you take off your shoes and socks, when the warming skin reactivates the sensation.
Dry, Scaly Soles and Heels
A second pattern affects the bottom and sides of the foot in a distribution that looks like a moccasin. Instead of the wet, peeling look between the toes, this type produces dry, silvery-white scaling that covers the sole and wraps up around the heel and sides. The skin feels thick and rough, almost like a callus, which is why many people don’t realize it’s a fungal infection at all. They assume their feet are just dry.
The key difference from ordinary dry skin is the pattern and persistence. Regular dryness tends to respond to moisturizer within a few days. Moccasin-type fungus doesn’t improve with lotion and gradually spreads to cover more of the sole. Over months, the thickened skin can crack along the heel, forming painful fissures that may bleed. This type is also more likely to spread to the toenails if left untreated, since the same fungus causes both conditions.
Blisters on the Arch and Sole
The blister-forming type is the least common but the most visually dramatic. It produces clusters of small, fluid-filled bumps that typically appear on the arch or bottom of the foot, though they can show up anywhere. The blisters range from tiny pinpoints to pea-sized and are usually filled with clear fluid. They can be intensely itchy.
When blisters break open, they leave raw, weeping patches that dry into crusted areas. This type sometimes flares suddenly and can be mistaken for an allergic reaction or eczema. One way to tell the difference: blister-type fungus tends to affect one foot or both feet asymmetrically, while contact dermatitis from a shoe material usually affects both feet in the same spots.
Toenail Fungus
Fungal nail infections often start alongside or shortly after a skin infection on the foot. The first sign is usually a white or yellow-brown spot under the tip of a toenail. Over weeks to months, that discoloration spreads toward the base of the nail as the fungus works deeper.
As it progresses, an infected nail becomes noticeably thicker than your other nails. The texture changes too: the nail turns brittle, crumbly, or ragged at the edges instead of smooth. In more advanced cases, the nail can become misshapen, warp upward, or separate from the nail bed entirely, leaving a gap where debris collects underneath. That trapped debris often gives the nail a dark brown or greenish tint. A foul smell is common in later stages. The big toe and little toe are the most frequently affected, likely because they experience the most pressure inside shoes.
How It Looks on Different Skin Tones
Most descriptions of foot fungus reference redness, but that’s primarily how it appears on lighter skin. On medium to dark skin tones, the inflammatory changes look different. Swollen or irritated skin may appear purple, violet, dark brown, or ashy gray rather than red. Scaling can look silvery or grayish-white. These color differences sometimes delay diagnosis because the infection doesn’t match the textbook photos people see online. The texture clues, such as peeling, cracking, maceration, and scaling, are more reliable indicators across all skin tones than color alone.
Foot Fungus vs. Eczema and Other Conditions
Several other conditions can mimic the look of foot fungus, which is part of why it’s worth knowing the specifics. Eczema on the feet produces dryness, rough or scaly patches, and inflamed skin that can ooze and crust, which overlaps significantly with fungal symptoms. The biggest difference is location: fungus gravitates toward the toe webs and soles, while eczema more commonly affects the tops of the feet, ankles, and areas near joints like the elbows and knees. Eczema also tends to appear symmetrically on both feet.
Psoriasis on the soles can produce thick, silvery plaques that look similar to moccasin-type fungus. Contact dermatitis from shoe materials or detergents usually affects the top of the foot where the shoe presses against the skin, which is an unusual spot for fungus. If an over-the-counter antifungal cream doesn’t improve things within two to four weeks, it’s a reasonable sign that the problem may not be fungal.
When Foot Fungus Gets Worse
Left untreated, foot fungus doesn’t just stay put. The cracked, broken skin it creates becomes an entry point for bacteria. Signs that a secondary bacterial infection has developed include increasing pain (rather than just itching), spreading redness or warmth beyond the original area, swelling, pus or cloudy drainage, and red streaks moving up the foot or leg. Fever alongside any of these symptoms signals that the infection may be spreading into deeper tissue.
People with diabetes face higher stakes. Reduced blood flow and nerve sensation in the feet mean fungal infections can progress without being noticed, and the cracked skin from untreated fungus is a common precursor to diabetic foot ulcers. Bacterial infections in diabetic feet tend to involve more aggressive organisms and can escalate quickly, making early identification of even mild fungal symptoms particularly important for anyone managing diabetes.