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    What is your diagnosis? Tinea nigra.

    Cutis 2009 Dec;84(6):292, 299-300
    Botsford General Hospital, Michigan State University, Farmington Hills, USA.

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    Bilateral tinea nigra plantaris and tinea nigra plantaris mimicking melanoma.
    Cutis 1999 Oct;64(4):265-8
    Department of Dermatology, New York-Presbyterian Hospital, Columbia Presbyterian Center, New York, USA.
    Tinea nigra, a superficial fungal infection caused by Phaeoannellomyces werneckii, presents as a hyperpigmented, nonscaling macule of variable size and shape. Typically lacking induration, erythema, or pruritus, these "ink spot" lesions may resemble junctional nevi or malignant melanoma. Rapid, noninvasive diagnosis can be provided by potassium hydroxide examination, demonstrating numerous large, dematiaceous hyphae. Read More