Tinea, also known as ringworm, is a common skin infection with a characteristic ring-like appearance. It is caused by several types of fungus and can appear on different parts of the body including the scalp, chest, feet, groin, face, hands and nails. Tinea is very contagious but easily treated.…
What is athlete's foot?
Athlete's foot, or tinea pedis, is a common fungal infection of the foot caused by a group of fungi called dermatophytes (also known as ringworm) that colonize the skin. It is a contagious condition that can be spread by direct or indirect contact with the infected skin.
Athlete's foot is caused by a group of fungi called dermatophytes. They use keratin, a component of skin, as an energy source. The severity of your response depends on the species and strain of dermatophyte causing the infection.
Risk factors for athlete's foot include:
- Damp, humid conditions, such as wearing damp socks;
- Walking barefoot in public areas such as locker rooms and communal showers or pools;
- Close contact with an infected person or animal;
- Sweaty feet confined in tight shoes, and;
- Having a weakened immune system.
Signs and symptoms
In athlete's foot, itchy blisters containing a clear fluid appear, usually between the toes. Other presentations of athlete's foot include:
- Pustules or blisters on the sides of the feet (caused by Tinea interdigitale);
- Ringworm-like patches on the top of the foot;
- Dry, patchy scales on the sole of the foot (chronic hyperkeratotic tinea), and;
- Dry, patchy scales on the whole of the sole, heel and sides of the foot (extensive hyperkeratotic tinea, usually caused by Tinea rubrum).
Methods for diagnosis
Potassium hydroxide exam
A scraping of your skin from the affected area is added to potassium hydroxide (KOH) and examined under a microscope. KOH destroys non-fungal cells, making it easier to see if any fungal cells are present.
A skin biopsy is performed only when other skin infections have to be ruled out.
Types of treatment
Athlete's foot is treated with antifungal creams such as ketoconazole and terbinafine that are applied directly to the affected area. Oral antifungal medications such as fluconazole are used for infections that do not respond well to topical cream. Treatment for some time after symptoms have subsided is needed to prevent the tinea's return.
Antifungal side effects
Oral antifungal medications can cause nausea and liver damage if used for a prolonged period of time. Antifungals applied to the skin can cause itching and a burning sensation.
Tinea spreads easily to other parts of the body. It can also result in breaks in the skin that cause permanent scarring, or lead to bacterial infections.
Although athlete's foot can usually be cured, it is common for it to come back. If athlete's foot keeps recurring, it is possible the fungus is present on another part of your body that you have not been treating, particularly under the nails.
Maintaining good hygiene by washing and drying properly, washing linen and towels in hot water and not sharing them with others can help prevent the spread of athlete's foot. You can reduce your risk of infection, and infection of others, by not walking barefoot in public showers or spaces such as gyms and pools.
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- Dermatophyte (tinea) infections. Accessed 16 September 2014 from http://www.uptodate.com/contents/dermatophyte-tinea-infections
- Diagnosis and Management of Common Tinea Infections - American Family Physician. Accessed 16 September 2014 from http://www.aafp.org/afp/1998/0701/p163.html
- Epidemiology of dermatophytoses: retrospective... [New Microbiol. 2012] - PubMed - NCBI. Accessed 16 September 2014 from http://www.ncbi.nlm.nih.gov/pubmed/22707134
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FAQ Frequently asked questions
What is tinea pedis?
Tinea pedis is a contagious fungal infection of the foot, known commonly as athlete's foot . It usually begins with itchy, fluid-filled blisters between the toes and is spread by direct or indirect contact with the skin. However, it can also present as dry, scaly …
What are the symptoms of tinea pedis?
Symptoms of tinea pedis are itchy blisters that contain a clear fluid, which most commonly occur between the toes. Other types of tinea pedis include pustules on the side of the feet (caused by tinea interdigital), and scaly, dry patches on the sole, …
What causes tinea pedis?
Tinea pedis is caused by a group of fungi called dermatophytes (also known as ringworm). Dermatophytes use keratin, a component of the skin, as an energy source. Depending on the species and strain of dermatophyte causing infection, the severity of your response …
How is tinea pedis diagnosed?
A skin scraping from the affected area is added to potassium hydroxide (KOH). KOH destroys fungal cells, which makes it easier to see if any fungal cells are present under a microscope.
How is tinea pedis treated?
Tinea pedis is treated with topical antifungal creams such as ketoconazole and terbinafine, applied directly to the affected area, or oral antifungal medications such as fluconazole. Treatment for a while after symptoms have disappeared is needed to prevent it …
Who gets tinea pedis?
Although anyone can get tinea pedis, it is more common in males in their late teens and early adulthood.
Can tinea pedis be prevented?
You can reduce your risk of getting it, or sharing it if you already have it, by not walking barefoot in public showers or spaces such as gyms and pools.
Can tinea pedis heal on its own?
No. If you have tinea pedis you will need to use antifungal medication to clear the infection.
Are there any side effects of antifungal medication for athlete's foot?
Long-term use of oral antifungal medications can cause nausea and liver damage. Topical antifungals can cause itching and burning.