Foot fungus typically appears as scaly, peeling, or cracked skin between the toes, often with redness or discoloration in the surrounding area. On lighter skin, the affected area usually looks red or pink. On darker skin tones, it can appear purple, gray, or brown instead. But foot fungus doesn’t always look the same. It takes three distinct forms, each with a different pattern, and it can also spread to your toenails.
The Three Types of Foot Fungus
Not all cases of athlete’s foot look alike. The appearance depends on which of three clinical subtypes you’re dealing with, and each one shows up in a different part of the foot with different skin changes.
Interdigital (Between the Toes)
This is the most common type and the one most people picture when they think of athlete’s foot. It shows up as peeling, flaking, or cracked skin in the spaces between your toes, most often between the outer three toes (the pinky side). The skin in those toe webs can look soggy and whitish, a texture called maceration, or it can be dry and scaly. You’ll often notice itching that gets worse right after you take off your socks and shoes, along with a burning or stinging sensation. In early stages, the changes can be subtle: just a bit of fine scaling or a small crack in one toe web that’s easy to overlook.
Moccasin (Bottom and Sides of the Foot)
Moccasin-type foot fungus is easy to mistake for simple dry skin because it develops slowly and covers a wide area. The soles of your feet become thick, scaly, and dry, and the scaling often extends up the sides of the foot in a pattern that traces the outline of a moccasin shoe. The skin may feel stiff or tight, and deep cracks (fissures) can form, especially on the heels. Because it lacks the dramatic peeling or blistering of other types, many people live with moccasin-type fungus for months or years without realizing it’s an infection.
Vesiculobullous (Blistering)
This is the least common but most visually striking type. Small fluid-filled blisters (under 10 mm) develop on the soles of the feet. These blisters can merge into larger ones over a centimeter across. The fluid inside is usually clear or slightly blood-tinged. This type often flares up as a worsening of an existing interdigital infection, so you may also see peeling between the toes at the same time. The blisters can be itchy and painful, and when they rupture, they leave raw, weeping patches of skin.
How It Looks on Different Skin Tones
Most medical references describe foot fungus as “red,” but that’s primarily how it looks on lighter skin. On medium to dark skin tones, the inflamed areas are more likely to appear purple, violet, or grayish rather than bright red. The scaling and peeling still look similar regardless of skin color, so texture changes are often the more reliable visual clue. If you’re checking your feet, pay attention to any skin that feels rough, flaky, or waterlogged between the toes, even if it doesn’t look classically “red.”
When It Spreads to Toenails
Foot fungus frequently jumps from the skin to the nails, especially if the skin infection goes untreated. Fungal nail infections typically start at the tip or sides of the nail and work their way back toward the cuticle. The earliest sign is usually a white, yellow, or greenish discoloration at the edge of the nail. Over time, the nail thickens, becomes brittle or crumbly, and may lift away from the nail bed. Chalky, powdery debris can build up underneath the nail. In some cases, the nail turns dark brown or gray. Unlike skin fungus, nail infections don’t usually itch, so they’re often noticed by appearance alone.
Foot Fungus vs. Psoriasis and Eczema
Several other skin conditions can look similar to foot fungus, and telling them apart matters because the treatments are completely different.
Psoriasis on the feet tends to produce thick, raised plaques that feel rough and inflamed. It often causes deep, painful cracks on the soles, and it usually appears on both feet at the same time. If you have psoriasis patches elsewhere on your body (elbows, knees, scalp), that’s a strong clue. A specific form called pustular psoriasis can produce small pus-filled bumps surrounded by inflamed skin, which can look similar to the blistering type of athlete’s foot.
Foot fungus, by contrast, typically starts in one spot and spreads outward if untreated. It responds to antifungal creams within a few weeks. If you’ve been applying an over-the-counter antifungal for two to four weeks and the skin isn’t improving, that’s a sign it may not be fungus at all. A doctor can confirm the diagnosis by scraping a small sample of skin and examining it under a microscope, where fungal infections show characteristic branching, thread-like structures that are unmistakable.
Signs That It’s Getting Worse
Uncomplicated foot fungus is annoying but not dangerous. The concern arises when cracked, broken skin opens the door to bacteria. Watch for increasing redness or warmth that spreads beyond the original scaly patch, swelling in the foot or lower leg, pus or cloudy drainage from cracked skin, or a foul smell that goes beyond normal foot odor. Pain that intensifies rather than just itching can also signal a bacterial infection layered on top of the fungal one. People with diabetes or circulation problems are at higher risk for these complications because their immune response in the feet is already compromised.