Ring-shaped rash
A patch with a raised, scaly, advancing border and a clearer center — the classic look of ringworm.
Medical Dermatology
Ringworm, athlete's foot & fungal skin infections (tinea)
An itchy, spreading, ring-shaped rash — or peeling, cracked skin between your toes — is often a fungal infection. Despite the name, ringworm has nothing to do with worms, and the right antifungal clears it.
Overview
Understanding ringworm & fungal infections
"Tinea" is the medical name for the common fungal skin infections caused by dermatophytes — fungi that live on the skin, hair, and nails. They go by different names depending on where they land: ringworm (tinea corporis) on the body, athlete's foot (tinea pedis) on the feet, jock itch (tinea cruris) in the groin, and scalp ringworm (tinea capitis) in the hair, which is most common in children. A related yeast causes tinea versicolor, which leaves light or dark patches on the trunk. Despite the name, ringworm involves no worm at all.
These infections are itchy and mildly contagious. They spread through skin-to-skin contact, shared towels, locker-room and pool floors, and even from pets, and they thrive in warm, damp skin — which is why feet, folds, and sweaty areas are favorite spots. Classic ringworm forms a ring with a raised, scaly, advancing border and a clearer center; athlete's foot causes itching, peeling, and cracking between the toes.
Fungal infections are easy to mistake for eczema, psoriasis, or other rashes — and treating them with a steroid cream can actually make them spread and look atypical (so-called "tinea incognito"). That's why confirming it's really fungus matters. A quick in-office test can settle the question, and once we know what we're dealing with, the right antifungal — topical for most cases, oral for scalp, nail, or widespread infections — clears it reliably.
Make sure it's actually fungus
The most common reason a "fungal" rash won't clear is that it was never fungus — or was treated with the wrong cream:
- Ringworm mimics eczema, psoriasis, and other rashes.
- Steroid creams can make it spread and lose its telltale ring ("tinea incognito").
- A quick in-office scraping/test can confirm fungus before treating.
- The right diagnosis points to the antifungal that will actually work.
Keep it from coming back
Fungi love warm, damp skin — a few habits make recurrence far less likely:
- Dry thoroughly after showering, especially between the toes and in skin folds.
- Change sweaty socks and clothing promptly; choose breathable footwear.
- Don't share towels, shoes, or razors; wear sandals in locker rooms and pools.
- Treat athlete's foot promptly so it doesn't spread to nails or the groin.
Signs & symptoms
What we look for
Itching
Most fungal rashes itch, sometimes with burning or stinging.
Peeling between the toes
Athlete's foot causes itchy peeling, cracking, and sometimes blisters between the toes and on the soles.
Groin rash
Jock itch forms an itchy, red, scaly rash in the groin and inner thighs, often sparing the scrotum.
Scaly, spreading edge
Fungal patches tend to slowly enlarge outward with a defined, scaly border.
Discolored patches
Tinea versicolor leaves light or dark, finely scaly patches on the chest, back, and shoulders.
How we treat it
Your treatment options
Treatment starts with confirming it's fungus, then choosing the right antifungal for where it is and how widespread it is. Most cases clear well; the key is treating long enough and drying out the conditions fungi love.
Confirm it's fungus
A quick in-office skin scraping (KOH prep) or culture can confirm a dermatophyte before treating — especially if a rash hasn't responded to other creams.
Topical antifungals
Antifungal creams or solutions clear most cases of ringworm, athlete's foot, and jock itch when used consistently for the full course.
Oral antifungals
Pills are used for scalp ringworm, nail involvement, widespread or stubborn infections, and cases that don't respond to topicals.
Treat tinea versicolor
Antifungal washes or creams — and sometimes oral medication — for the discolored trunk patches, with a plan to prevent its frequent return.
Stop the steroid trap
If a steroid cream was masking or spreading the infection, we correct course so the antifungal can work.
Prevent recurrence
Practical habits — drying thoroughly, breathable footwear, not sharing towels/shoes — plus treating athlete's foot early so it doesn't reach the nails.
When to come in
Come in if a rash is spreading, keeps coming back, or hasn't cleared with an over-the-counter antifungal — and especially if it's on the scalp, involves the nails, or you're not sure it's really fungus. Scalp ringworm in children and nail involvement need oral treatment, and a rash that isn't fungus needs a different plan entirely. A quick exam and test point you to what actually works.
Schedule with JuniperCommon questions
Ringworm & Fungal Infections FAQ
Is ringworm actually a worm?
No — despite the name, there's no worm involved. Ringworm is a fungal infection of the skin caused by dermatophytes, named for the ring-shaped rash it often creates: a raised, scaly border with a clearer center. The same family of fungi causes athlete's foot and jock itch. It's treated with antifungal medication, not anything aimed at parasites.
Is ringworm contagious?
Yes, mildly. Fungal skin infections spread through direct skin-to-skin contact, shared towels, clothing, and shoes, locker-room and pool floors, and sometimes from pets. To limit spread, don't share personal items, wear sandals in communal showers, wash and dry the area, and start treatment promptly. You can usually go about normal activities while treating it, but covering an active rash is sensible.
Why won't my ringworm go away?
The two most common reasons are that it isn't actually fungus — eczema and psoriasis look similar — or that it was treated with a steroid cream, which can make fungus spread and lose its ring ("tinea incognito"). Under-treating (stopping too soon) also lets it return. We confirm it's fungus with a quick test, then match the antifungal to the location and extent so it clears for good.
How do you treat athlete's foot and jock itch?
Most cases respond to a topical antifungal used consistently for the full recommended course, along with keeping the area dry. For stubborn, widespread, or recurring cases — or when the nails are involved — an oral antifungal may be needed. Preventing recurrence matters too: dry thoroughly between the toes and in folds, change sweaty socks and clothing, and wear breathable footwear.
When do fungal infections need prescription pills?
Oral antifungals are used for scalp ringworm (which creams can't reach well), fungal nail infections, and infections that are widespread, stubborn, or unresponsive to topical treatment. Because oral antifungals can interact with other medications and occasionally affect the liver, we choose them carefully and monitor when appropriate — another reason to have a persistent or extensive infection evaluated rather than guessing.
Bend & Redmond · Central Oregon
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