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By Mayo Clinic staffYour doctor can determine if you have jock itch or another skin disorder, such as a dermatitis or psoriasis.
Your doctor may take skin scrapings or samples from the infected area and view them under a microscope. This is called a potassium hydroxide (KOH) test. If a sample shows fungi, treatment may include an antifungal medication. If the test is negative, but your doctor still suspects that you have jock itch, a sample may be sent to a lab to determine whether it will grow fungi under the right conditions. This test is known as a culture. Your doctor may also order a culture if your condition doesn't respond to treatment.
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