Diagnosing Athlete's Foot
In some cases, your doctor may be able to diagnose athlete's foot simply by looking at it. To help confirm the diagnosis and rule out other conditions, your doctor might take a skin scraping or skin sample from your foot for testing in a lab.
The most reliable way to diagnose athlete’s foot is to correctly identify its cause. Fungal athlete's foot is relatively straightforward to diagnose and treat. Visualization of the fungus in skin scrapings removed from the affected areas of the feet is a painless and cost-effective method for diagnosis. Rarely, it is necessary to identify fungi in portions of skin removed during a biopsy. If no fungus is found, other causes of athlete's foot must be investigated.
Your doctor will ask about your symptoms and about factors that make you more likely to develop athlete's foot, such as your use of public sports facilities, clubs or showers. Your doctor will ask about the type of shoes and socks you wear, what kind of work you do and what you wear on your feet to work.
Your doctor usually can diagnose athlete's foot simply by looking at your feet. To confirm the diagnosis, your doctor can gently scrape some flakes of skin from a scaly portion of your foot onto a slide. The dermatophytes that cause the infection often show up under a microscope.
Information from https://www.mayoclinic.org/ website
Information from https://www.medicinenet.com/ website
Information from https://www.health.harvard.edu/ website
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