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The diagnosis is primarily based on the appearance of the skin. If tests are used, they may include the following:
- A KOH (potassium hydroxide) test, in which skin scrapings are dissolved in KOH and then examined under a microscope. This test is painless and easy, and the results are available immediately.
- A skin lesion biopsy with microscopic examination or culture to look for dermatophytes.
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