Infections
Ringworm and athlete's foot
Ringworm and athlete's foot are common skin infections caused by fungi, not worms. They often cause an itchy, scaly, sometimes ring-shaped rash.
Reviewed by Raashid Haque, MD, board-certified dermatologist
For education only. This guide does not diagnose or treat any condition.
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Drier feet make it harder for athlete's foot to take hold or come back.
Look for
- Moisture-wicking synthetic blend or fine merino
- No bulky seams over the toes
- Snug fit that does not bunch
Full details, cautions and sourcesAvoid
- Thick cotton socks for heavy sweating or exercise
- Socks that are too tight or too loose
These are products Dr. Haque has reviewed and recommends for different reasons. Unless a product is clearly marked 'Affiliate link,' it is not one. Most are not.
Food and lifestyle may play a part in Ringworm and athlete's foot too
Anti-inflammatory eating and lifestyleLearn about Ringworm and athlete's foot
"Ringworm" is the common name for a group of fungal skin infections called tinea. The fungi, called dermatophytes, feed on keratin, the protein in the outer skin, hair, and nails. The name changes with the body area:
- Tinea corporis (body): patches on the trunk, arms, or legs.
- Tinea pedis (athlete's foot): between the toes, on the soles, or along the sides of the feet.
- Tinea cruris (jock itch): the groin and inner thighs.
- Tinea capitis (scalp): scaly or bald patches on the scalp, most common in children.
Anyone can get these infections. They are more common in warm, humid weather and in people who sweat a lot, play contact sports, or have close contact with animals.
A classic patch is round or oval with a raised, scaly edge and sometimes clearer skin in the middle. Not every patch looks like a ring. Athlete's foot may look like peeling, cracking, or soggy skin between the toes, or dry scale on the sole.
On lighter skin, patches often look pink or red. On brown and Black skin, they may look brown, gray, purple, or darker than the surrounding skin, and the redness can be hard to see. Many other rashes can look similar, so only a clinician can say what a rash is.
These infections can clear with treatment but may come back if moist conditions return. They are contagious, and they are not worms.
Self-care
What it is
Gentle washing, drying well (especially between the toes and in skin folds), and changing out of damp clothes and socks.
Often considered when
Used alongside any medical treatment, and to lower the chance of the infection returning.
Less suitable or needs caution when
It is rarely harmful, but it does not clear an established infection on its own. Harsh scrubbing can irritate skin.
What to watch for
Skin that becomes more red, sore, or cracked, which may mean irritation or a bacterial infection.
How long to judge it
Helpful right away for comfort. Judging whether the infection itself is improving usually takes a few weeks.
Questions to ask
- Is my rash really a fungal infection?
- What drying or washing habits make sense for my skin?
- Should I also be treating other areas, like my feet or groin?
Over the counter
What it is
Non-prescription products that kill or stop the growth of fungus on the skin. Common classes are azoles (such as clotrimazole and miconazole) and allylamines (such as terbinafine). Sprays and powders are also sold.
Often considered when
Clinicians commonly consider these for mild, limited patches of body, groin, or foot ringworm.
Less suitable or needs caution when
Less suitable for the scalp, widespread rashes, nails, or when the diagnosis is uncertain. Check product labels for age limits and for use in pregnancy, and ask a clinician or pharmacist if unsure. Avoid if you have had an allergic reaction to the product.
What to watch for
Burning, stinging, new redness, or swelling after use, which may be irritation or allergy. A rash that is not improving.
How long to judge it
Many people judge progress over a few weeks. Product labels and clinicians give timing for each product.
Questions to ask
- Which type of antifungal fits my rash?
- How will I know if it is working?
- When should I come back if it does not clear?
What it is
Hydrocortisone and stronger steroid creams calm redness and itch, but they do not kill fungus. On a fungal rash they can make it look better for a while, then let it spread or change shape, a pattern sometimes called tinea incognito.
Often considered when
A clinician may sometimes choose a combination antifungal and steroid product for a short time when there is a lot of inflammation. This is a clinician decision, not a first guess.
Less suitable or needs caution when
Less suitable for a rash that might be fungal and has not been diagnosed, and for the face, groin, and skin folds, where steroids can thin the skin more easily.
What to watch for
A rash that looks better, then returns bigger, redder, or with bumps. Thin, shiny, or stretched skin. A rash that no longer has its classic edge, which can make it harder to recognize.
How long to judge it
If a rash returns or changes after steroid use, it is worth being seen rather than waiting.
Questions to ask
- Could a steroid cream have changed how my rash looks?
- Is a combination cream right for me, and for how long?
- Do you want to confirm the diagnosis with a skin scraping?
Prescription creams and gels
What it is
Stronger or different creams, gels, solutions, or shampoos, such as other azoles (ketoconazole, econazole), allylamines (naftifine), and ciclopirox.
Often considered when
Often considered when an over-the-counter product has not worked, the rash is larger, or the skin is very inflamed or cracked.
Less suitable or needs caution when
Less suitable for scalp infections or deep infections of hair follicles, which usually need oral medicine. Allergy to an ingredient, pregnancy, and young age may change the choice.
What to watch for
Skin irritation, burning, or allergic rash. Not improving after the expected time.
How long to judge it
A clinician will give a follow-up window, often a few weeks for skin and longer for thick skin on the soles.
Questions to ask
- Why this product instead of an over-the-counter one?
- Is it safe for my age, or if I am pregnant or breastfeeding?
- What should I do if the rash returns?
Pills
What it is
Antifungal pills or liquids that work from inside the body, such as terbinafine, griseofulvin, itraconazole, and fluconazole.
Often considered when
Often considered for scalp ringworm, widespread or stubborn skin infections, infections that keep returning, and some nail infections.
Less suitable or needs caution when
May be less suitable with liver disease, some heart conditions, pregnancy or breastfeeding, or when taking medicines that interact. Choice and use in children are decided by a clinician.
What to watch for
Stomach upset, rash, and possible effects on the liver. Some clinicians check blood tests. Tell the clinician about all your medicines and supplements.
How long to judge it
Courses vary and can last weeks or longer, depending on the area. Your clinician sets the plan and timing.
Questions to ask
- Do I need a pill instead of a cream, and why?
- What interactions or blood tests should I know about?
- What should I do if I get side effects?
What it is
A fungal infection of the scalp skin and hair shafts. Creams and shampoos alone usually cannot reach the fungus in the hair follicle, so oral medicine is the usual approach, sometimes with a medicated shampoo to lower spread.
Often considered when
Considered whenever there are scaly patches, broken hairs, black dots, or hair loss on the scalp, especially in school-age children. Brown and Black children, and people with tight hairstyles or coily hair, may have subtle scale that is easy to miss.
Less suitable or needs caution when
Self-treating with over-the-counter creams is less suitable. Close contacts and household pets may need to be checked too.
What to watch for
A tender, boggy, swollen area (a kerion), pus, fever, swollen glands, or scarring hair loss. These need prompt attention.
How long to judge it
Treatment is usually longer than for skin. A clinician decides how long, and follow-up is common.
Questions to ask
- Does this need a scraping or hair culture to confirm?
- Should family members or pets be checked?
- When can my child return to school or sports?
What it is
Fungus can infect the nails, often after long-standing athlete's foot. Nails may thicken, turn yellow, white, or brown, and crumble or lift.
Often considered when
Considered when nails look changed and a lab test (nail clipping) confirms fungus, since other conditions can look similar. Options a clinician may discuss include oral antifungals and medicated nail lacquers or solutions.
Less suitable or needs caution when
Skin creams alone usually do not clear nail infection. Oral medicine may be less suitable with liver disease or interacting medicines. If nails look fine and are not bothersome, some people and clinicians choose not to treat.
What to watch for
Pain, redness around the nail, or foot sores. Nail infection can also keep reseeding the skin.
How long to judge it
Nails grow slowly. It can take many months to see clear nail growth, and the infection can return.
Questions to ask
- Do I need a nail test before treatment?
- Which option fits my health and medicines?
- How can I lower the chance of reinfection?
Lifestyle and holistic
What it is
Everyday steps that keep skin drier and less irritated: breathable shoes and moisture-wicking socks, rotating shoes, drying fully after showers, loose clothing in warm weather, and wearing sandals in shared showers and pool areas.
Often considered when
Often discussed for people who sweat heavily, exercise a lot, wear tight clothing or work boots, or have repeated infections.
Less suitable or needs caution when
These steps support treatment but do not replace it. Wash towels, socks, and bedding as directed by a clinician or product label.
What to watch for
Skin that stays damp, cracks, or blisters even with these habits.
How long to judge it
Best viewed as long-term habits, not a quick fix.
Questions to ask
- Which habits matter most for my situation?
- Should I treat my shoes or socks too?
- Could I be spreading it to family members?
Fungi grow best on warm, damp skin. Common ways people pick them up or keep them going:
- Skin-to-skin contact, including sports such as wrestling.
- Pets and farm animals, especially kittens and puppies, even when the animal looks healthy.
- Damp shared spaces such as locker rooms, pool decks, and shared showers, where bare feet touch the floor.
- Shared items such as towels, razors, combs, clothing, and sports gear.
- Sweat, friction, and tight or non-breathable clothing and shoes, which keep skin moist.
- Small breaks in the skin and, sometimes, a weakened immune system or diabetes.
- Fungus spreading from one body area to another, for example from the feet to the groin.
| Topic | Evidence | What it means |
|---|---|---|
| Sweat and exercise | Promising | Exercise is good for health, but staying in damp clothes afterward can help fungus grow. Changing out of sweaty clothes and drying well is commonly suggested, though high-quality studies on this are limited. |
| Drying habits after bathing | Early | Drying between the toes and in skin folds is widely recommended by dermatology groups. Direct research on how much it prevents infection is limited. |
| Blood sugar and overall health | Promising | Diabetes and some other health conditions are linked with more frequent or harder-to-clear fungal infections. Working with your care team on those conditions is a reasonable part of the picture. |
| Diet | Anecdotal | No food or diet has been shown to treat or prevent ringworm. Online claims about cutting out sugar or taking supplements are not well supported. Restrictive diets can cause harm, so talk with a clinician first. |
Read: Anti-inflammatory eating
Avoid very restrictive diets, especially for children, unless a clinician is guiding you.
Ringworm and athlete's foot ·
When to get care soon
Consider contacting a clinician soon if you notice:
- Scaly, itchy, or bald patches on the scalp, especially in a child. Scalp ringworm usually needs a clinician's evaluation and treatment taken by mouth.
- Signs of a bacterial infection, such as increasing pain, warmth, swelling, pus, red streaks, or fever.
- A rash that is spreading quickly, is widespread, or keeps returning.
- A rash that has not improved after a couple of weeks of self-care, or that got worse after using a steroid cream.
- Thick, discolored, or crumbling nails, or nail changes along with the skin rash.
- Diabetes, a weakened immune system, or a foot rash with cracks, sores, or swelling.
- A rash on the face or near the eyes, or when you are not sure it is ringworm.
- A baby or a pregnant person with a suspected infection.
About the reviewer
Raashid Haque, MD
Board Certified Dermatologist · Charlotte, NC
- 25+ years of clinical experience
- Dermatology at University of Oklahoma - Chief Resident
- Internship at Baylor College of Medicine
- LSU School of Medicine Shreveport - Valedictorian, AOA