Ringworm Symptoms, Causes, Treatment and Prevention
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Introduction
Ringworm is a contagious fungal infection, not an illness caused by a worm 6. It can affect the skin, scalp, hair, or nails 6,7. Athlete’s foot, jock itch, and many fungal nail infections are forms of ringworm 6.
This guide explains ringworm symptoms, causes, treatment and prevention. It also covers testing, medicine, hygiene, and ways to limit its spread.
Overview: What Is Ringworm?
Ringworm is a fungal infection
Ringworm is also known as tinea 7. Dermatophytes are fungi that live on keratin, a firm protein in skin and hair 7. These fungi can also affect the nails 2,7.
Common dermatophyte groups include *Trichophyton*, *Microsporum*, and *Epidermophyton* 2,6. The medical name for ringworm changes based on the infected body area 6.
Types of ringworm by body location
Ringworm can take several forms across the body:
Tinea corporis affects areas such as the trunk, neck, arms, and legs 2.
Tinea pedis, or athlete’s foot, affects the feet and spaces between toes 6,7.
Tinea cruris, or jock itch, affects the groin and upper thighs 7.
Tinea capitis affects the scalp and is mainly seen in children 7.
Tinea unguium, or onychomycosis, affects fingernails or toenails 6,7.
Tinea faciei affects the face, while tinea manuum affects the hands 2.
The signs and treatment needs can differ by location. This makes the affected area an important part of medical assessment.
Who has a higher risk?
Anyone can get ringworm 6. However, some people have more exposure or greater trouble fighting the infection.
The following groups may face a higher risk:
Children have a higher risk of body and scalp ringworm 2.
Contact-sport athletes face exposure through skin contact and shared equipment 6,7.
People who sweat heavily have a greater risk of infection 2,6.
People using public showers without footwear face greater exposure 6.
People working closely with infected animals may develop ringworm 8.
People with diabetes or weak immune systems have increased risk 2.
People wearing tight clothes may have more frequent or severe infections 2.
Warm and humid settings are linked with more frequent and severe disease 2. People with weak immunity may develop widespread or unusual infections 2,7. Diabetes is also linked with recurring fungal nail infections 1.
Symptoms and Appearance
Common signs of a ringworm rash
A typical ringworm rash is itchy, scaly, and circular or oval 2,9. It often has a raised edge that expands outward 2,9. The middle may become clearer or keep some mild scaling 2.
Some rings may overlap or join together 2,9. Small bumps or blisters can appear along the edge 2,9. Not every rash has a perfect ring shape 3.
Rash color can vary with skin tone. Ringworm often looks red on light skin 6. It can appear brown or gray on darker skin 6. Some patches look reddish, purple, brown, or gray on Black and brown skin 9.
Ringworm can resemble other skin problems 6. A healthcare professional may use testing to find the cause 6.
Symptoms on the scalp, feet, groin, and nails
The affected body area can shape the signs. Common patterns include the following:
Scalp ringworm may cause itching, scaling, redness, bald spots, or hair loss 7,8.
Athlete’s foot may cause itching, burning, scaling, or cracked skin 7,8.
Jock itch may cause an itchy rash across the groin and upper thighs 7,8.
Hand ringworm may cause dry palms, cracked skin, or ring-shaped patches 8.
Beard ringworm may cause crusted or pus-filled patches 8.
Nail ringworm may cause thick, brittle, misshapen, or discolored nails 6,7.
Scalp ringworm may cause lasting hair loss when treatment is delayed 7. Nail infection can cause deformity and affect movement in some older adults 7.
Injuries and other problems can also change a nail’s color or shape 1. Ask a healthcare professional about testing before starting fungal nail treatment 1.
Severe or drug-resistant infections
Emerging ringworm types have been reported worldwide and in the United States 3. Some cause severe infections or resist standard antifungal drugs 3.
Three emerging types have been reported in the United States:
*Trichophyton indotineae* may not respond to standard antifungal medicines 3.
Terbinafine-resistant *Trichophyton rubrum* may resist a common antifungal drug 3.
*Trichophyton mentagrophytes* genotype VII is commonly called TMVII 3,5.
Emerging infections may cover large areas of the body 3. Their rashes may be painful, inflamed, itchy, scaly, or pus-filled 3. They can affect the face, groin, genitals, buttocks, limbs, or trunk 3.
TMVII often spreads through close skin contact, including intimate or sexual contact 5. It may cause deep, inflamed bumps or pus-filled sores 5. TMVII infections may last longer and be harder to treat 5.
Causes, Spread, and Risk Factors
Fungi that cause ringworm
Dermatophyte fungi cause ringworm by growing on tissues that contain keratin 2,7. These tissues include skin, hair, and nails 7.
The main fungal groups are *Trichophyton*, *Microsporum*, and *Epidermophyton* 2,6. Different species may have links to different sources.
For example, *Microsporum canis* often affects people with close cat or dog contact 2. *Trichophyton tonsurans* can spread through contact with a person who has scalp ringworm 2.
How ringworm spreads
Ringworm can spread through people, animals, objects, and shared surfaces 6,7. Soil can also spread infection, but this route is less common 8,9.
The main routes of spread include the following:
Direct skin contact can spread ringworm between people 6,9.
Touching an infected pet or livestock animal can spread the fungus 8,9.
Shared towels, bedding, clothes, brushes, or sports equipment can carry fungi 6,7.
Locker room, shower, and public bathroom floors may become contaminated 6,7.
Long contact with highly infected soil may sometimes spread ringworm 9.
Intimate or sexual skin contact may spread certain emerging infections 3,5.
TMVII may spread through towels, bedding, clothes, razors, or sex toys 5. However, the risk from these objects is not yet clear 5.
Animals with ringworm may have areas where fur is missing 9. A veterinarian can assess and treat a pet with suspected ringworm 7,9.
Environmental and personal risk factors
Dermatophyte fungi thrive in warm and damp places 7. Public showers, locker rooms, and pools can increase exposure 6,7.
Several personal and environmental factors can raise risk:
Tight clothes, shoes, or socks can hold moisture near the skin 2,6.
Heavy sweating can create conditions linked with fungal growth 2,6.
Shared clothing or towels can expose skin to contaminated material 7,9.
Wrestling and similar sports involve direct skin contact 6,9.
Close contact with an infected person or animal raises exposure 7,9.
Diabetes and weak immunity can increase the risk of ringworm 2.
Warm climates and humid settings are linked with greater risk 2,9.
People with weak immune systems may struggle to fight ringworm 6,9. Their infections may also look unusual or become widespread 2,7.
Diagnosis and Treatment
How healthcare professionals diagnose ringworm
A healthcare professional may diagnose ringworm by examining the skin and reviewing symptoms 2,8. However, other skin and nail conditions can look similar 6.
Testing can help confirm whether a fungus is present. Possible tests include the following:
A clinician may collect a skin scraping or nail clipping 7.
The sample may be examined under a microscope 2,7.
A laboratory may grow the fungus through a fungal culture 2,7.
Molecular tests may identify fungal material in the sample 2,7.
A potassium hydroxide test helps reveal fungal structures in skin scrapings 2. Culture or molecular testing may help when treatment has not worked 2. Drug testing may guide care for infections that resist initial medicine 2.
Tell the clinician about recent travel when resistant ringworm is possible 3. Some resistant infections are more common in parts of South Asia 3.
Topical ringworm treatment
Localized skin ringworm often responds to topical antifungal medicine 1,2. “Topical” means the medicine goes directly on the skin.
Common topical antifungal ingredients include the following:
Clotrimazole is available in products used on the skin 1,7.
Miconazole stops the growth of fungi that cause infection 4.
Terbinafine is available in topical and oral forms 1,7.
Econazole and ciclopirox are other topical options 7.
Skin ringworm, athlete’s foot, and jock itch often need two to four weeks of treatment 1. Follow the product label or prescription for the full stated period 1. Keep using the medicine as directed when symptoms start improving 1.
Not every miconazole product treats every fungal condition 4. Read the label and select a product for the affected area 4. Contact a clinician if symptoms worsen or do not improve during the stated period 4.
Oral treatment for scalp or severe infection
Scalp ringworm needs prescription oral medicine for one to three months 1. Creams, lotions, and powders do not treat scalp infection effectively 1.
Prescribed scalp medicines may include griseofulvin, terbinafine, itraconazole, or fluconazole 1. Antifungal shampoo may limit spread, but it does not replace oral medicine 8.
Oral antifungal treatment may also be needed in these cases:
Severe or widespread infections may require oral antifungal treatment 2,7.
Infections that resist topical treatment may need oral medicine 2,7.
Fungal nail infections often need prescription medicine taken by mouth 1.
Some emerging infections require several weeks or months of oral treatment 3,5.
Testing is advised before treatment for a suspected fungal nail infection 1. Nail infection may take several months to one year to go away 1. The infection can return after treatment 1.
Why steroid creams can cause harm
Do not use steroid creams on suspected ringworm without professional direction 1,3. Corticosteroid is another name for this type of steroid medicine 1,6.
Steroids weaken the skin’s ability to fight the fungus 1. This can allow the infection to cover more skin 1. Steroid creams can also increase burning and redness 1.
These creams may change the ringworm rash 1. That change can make later diagnosis more difficult 1. Some nonprescription rash products contain corticosteroids 1,6.
Prevention
Daily steps to prevent ringworm
Good hygiene can lower exposure and help prevent ringworm. Consider these practical daily steps:
Keep the skin clean and dry, especially in sweaty areas 3,7.
Change socks and underwear every day 3,6.
Wear sandals in public showers, locker rooms, and pool areas 3,7.
Avoid sharing towels, bedding, clothes, brushes, razors, or sports gear 3,6.
Keep fingernails short and clean 6.
Clean shared equipment and surfaces that may carry the fungus 7,9.
Shower after contact sports and clean uniforms and equipment 9.
Avoid tight clothing that holds warmth and moisture near the skin 2,9. Keeping affected skin clean and dry also supports treatment 7.
How to avoid spreading an active infection
Avoid skin contact with anyone who has known or suspected ringworm 3,6. This advice includes intimate and sexual contact 3,6.
Use these steps while a rash is being checked or treated:
Avoid touching or scratching the affected skin 5.
Wash your hands after touching a rash or an animal 3,5.
Do not share clothes, bedding, towels, razors, or care items 3,5.
Wash affected towels, clothes, and bedding on high heat when possible 5.
Clean shared equipment and surfaces that may be contaminated 7.
Arrange veterinary care when a pet may have ringworm 7,9.
Avoid intimate contact while a suspected rash is being assessed 3,5.
Cover lesions with clothing or a secure bandage if contact cannot be avoided 5. A clinician may suggest telling partners when sexual contact may have spread ringworm 3. The clinician may also discuss testing for other sexually transmitted infections 3.
When to See a Doctor
Contact a healthcare professional for suspected scalp ringworm or fungal nail infection 1. These infections may require testing and prescription treatment 1.
Medical assessment is also advised in the following situations:
The rash spreads widely or appears more severe than expected 1,3.
The rash becomes painful, inflamed, or filled with pus 3.
The rash affects the face, genitals, groin, or buttocks 3,5.
The infection keeps returning after treatment 3.
Symptoms do not improve with proper nonprescription treatment 1,3.
Symptoms worsen during topical miconazole treatment 4.
A rash follows contact with someone who had severe ringworm 1.
A new or unexplained rash appears after intimate contact 5.
A healthcare professional can test whether fungus is causing the symptoms 6. Testing can also guide care when common antifungal medicine does not work 2,3.
Conclusion
Ringworm is a fungal infection of the skin, scalp, hair, or nails 6,7. It can spread through people, animals, objects, surfaces, and sometimes soil 7,9.
Localized skin infections often respond to correctly used topical antifungal medicine 1,2. Scalp, nail, widespread, or lasting infections may need professional care 1,2.
Steroid creams can worsen ringworm and hide its usual appearance 1. Clean, dry skin and unshared personal items can help limit transmission 3,6,7.
Understanding ringworm symptoms, causes, treatment and prevention supports earlier care. These steps can also reduce exposure among families, partners, teammates, and pets.
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