This topic is about ringworm of the skin, groin, or hands. For information about other fungal infections, see the topics:
Ringworm of the skin is an infection caused by a fungus.
Jock itch is a form of ringworm that causes an itchy rash on the skin of your groin area. It is much more common in men than in women. Jock itch may be caused by the spread of athlete's foot fungus to the groin.
Ringworm is not caused by a worm. It is caused by a fungus. The kinds of fungi (plural of fungus) that cause ringworm live and spread on the top layer of the skin and on the hair. They grow best in warm, moist areas, such as locker rooms and swimming pools, and in skin folds.
Ringworm is contagious. It spreads when you have skin-to-skin contact with a person or animal that has it. It can also spread when you share things like towels, clothing, or sports gear.
You can also get ringworm by touching an infected dog or cat, although this form of ringworm is not common.
Ringworm of the skin usually causes a very itchy rash. It often makes a pattern in the shape of a ring, but not always. Sometimes it is just a red, itchy rash.
Jock itch is a rash in the skin folds of the groin. It may also spread to the inner thighs or buttocks.
Ringworm of the hand looks like athlete's foot. The skin on the palm of the hand gets thick, dry, and scaly. And skin between the fingers may be moist and have open sores.
If you have a ring-shaped rash, you very likely have ringworm. Your doctor will be able to tell for sure. He or she will probably look at a scraping from the rash under a microscope to check for the ringworm fungus.
Most ringworm of the skin can be treated at home with creams you can buy without a prescription. Your rash may clear up soon after you start treatment, but it's important to keep using the cream for as long as the label or your doctor says. This will help keep the infection from coming back. If the cream doesn't work, your doctor can prescribe pills that will kill the fungus.
If ringworm is not treated, your skin could blister, and the cracks could become infected with bacteria. If this happens, you will need antibiotics.
If your child is being treated for ringworm, you don't have to keep him or her out of school or day care.
To prevent ringworm:
If you or someone in your family has symptoms, it is important to treat ringworm right away to keep other family members from getting it.
Ringworm infection is caused by a fungus. Fungi (plural of fungus) that cause ringworm live and spread on the outer layer of skin. Ringworm is not caused by a worm or other parasite.
Fungi are present everywhere in our environment, including on the human body. They thrive in warm, moist areas, such as locker rooms and swimming pools, and in skin folds. You can get ringworm of the skin by sharing contaminated towels, clothing, and sports equipment, and by direct contact with an infected person.
Ringworm of the skin (tinea corporis) is most commonly caused by the fungus Trichophyton rubrum, which spreads from one person to another. It can also be caused by Microsporum canis, which is spread by cats and dogs. This type is less common but causes a more severe infection.
People often get ringworm of the groin ("jock itch") by accidentally spreading athlete's foot fungus to their own groin area. People who have athlete's foot also commonly spread it to their hands (tinea manuum).
Some people are more likely to get fungal infections than others. The tendency to get fungal skin infections or to have them return after treatment seems to run in families.
Most ringworm infections cause a rash that may be peeling, cracking, scaling, itching, and red. Sometimes the rash forms blisters, especially on the feet.
Symptoms of ringworm of the body include a rash:
Symptoms of ringworm of the face include a rash:
Symptoms of ringworm of the groin (jock itch) include a rash:
Symptoms of ringworm on the hand include a rash:
Fingernails can also be infected. For more information, see the topic Fungal Nail Infections.
Ringworm of the skin may be confused with other conditions with similar symptoms, such as eczema or psoriasis.
Ringworm of the skin can start as a small patch of itchy, red, or scaling skin. The rash can spread and cover a large area.
Clothing that rubs the skin can irritate the rash. Sweat, heat, or moisture in the air (humidity) can make the itching and infection worse.
As the infection becomes worse, the ring-shaped pattern and red-brown color may become more visible. If not treated, the skin can become irritated and painful. Skin blisters and cracks can become infected with bacteria and require antibiotics.
Ringworm can also spread to other parts of the body, including the feet, nails, scalp, or beard.
After treatment, the rash will go away. But ringworm can return unless you follow steps to prevent it. The tendency to get fungal skin infections or to have them return after treatment seems to run in families.
Your risk of getting ringworm is higher if:
If you suspect you have ringworm of the skin, call your doctor if:
Watchful waiting is a wait-and-see approach. If you get better on your own, you won't need treatment. If you get worse, you and your doctor will decide what to do next.
You can treat ringworm at home with medicines you can buy without a prescription. If symptoms do not improve after 2 weeks of treatment with this medicine, call your doctor.
Any persistent, severe, or recurring infection should be checked by your doctor.
The following health professionals can diagnose and treat ringworm of the skin:
Doctors often can easily recognize ringworm by its ring-shaped rash. Your doctor will probably also look at a skin sample (KOH preparation) under a microscope to confirm that fungus is present.
Tests for ringworm of the skin include:
Most cases of ringworm of the skin, including jock itch and ringworm of the hand, can be treated with creams or ointments that you put on your skin to kill fungi. These are called topical antifungals. You can get many topical antifungals without a prescription. Brand names include Micatin, Tinactin, Mycelex, and Lamisil.
You may need to take antifungal pills (oral treatment) if the ringworm does not go away after you have tried different topical antifungals or if the infection is widespread. Oral treatments include azoles such as fluconazole (Diflucan), allylamines such as terbinafine (Lamisil), and griseofulvin (Grifulvin V).
Your rash may start to clear up soon after you begin treatment, but it is important to use the medicine exactly as the label or your doctor says. This will help keep the infection from coming back. You will probably need to continue treatment for 2 to 4 weeks.
If not treated, ringworm can spread and the skin can become irritated and painful. Skin blisters and cracks can become infected with bacteria. If this happens, you may need to take antibiotics.
You should treat a fungal infection right away. Severe and widespread infections can be hard to treat.
To prevent ringworm of the skin:
In most cases, you can treat ringworm of the skin with antifungal creams or ointments. Many are available without a prescription. Use a nonprescription antifungal cream with miconazole or clotrimazole in it. Brand names include Micatin, Mycelex, and Tinactin. Terbinafine cream (Lamisil) is also available without a prescription.
If your rash does not clear after you have tried different topical antifungals, or if the infection is widespread, you may need prescription antifungal pills.
If you have both athlete's foot and ringworm of your groin or legs, you should treat both infections. This will prevent you from re-infecting your legs or groin with the athlete's foot fungus, when you put on your underwear.
Most ringworm infections of the skin can be treated at home with nonprescription antifungal creams. The rash will usually improve within 2 weeks.
If the rash does not improve after you have used an antifungal cream and it is severe and widespread or returns frequently, you may need antifungal pills that your doctor prescribes. When you are treating ringworm, it is important to finish the full course of medicine prescribed, even if the symptoms have gone away, so that the infection does not return.
The most common antifungals used to treat ringworm of the skin are:
Clotrimazole/betamethasone (Lotrisone), a combination antifungal and corticosteroid, is sometimes used to treat ringworm that is burning, itchy, and inflamed. This prescription medicine should be used with caution and for no longer than 2 weeks, because complications can occur with long-term use of corticosteroids.
People who are taking antifungal pills should have a doctor monitor their blood counts and liver and kidney function during treatment to watch for any harmful side effects.
Other Works Consulted
- Grossberg R (2015). Fungal diseases of the skin. In ET Bope et al., eds., Conn's Current Therapy 2015, pp. 261–262. Philadelphia: Saunders.
- Habif TP, et al. (2011). Tinea of the body (tinea corporis) and face (tinea faciei). In Skin Disease: Diagnosis and Treatment, 3rd ed., pp. 275–279. Edinburgh: Saunders.
- Hall JC (2010). Dermatologic mycology. In JC Hall, ed., Sauer's Manual of Skin Diseases, 10th ed., pp. 246–266. Philadelphia: Lippincott Williams and Wilkins.
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