Thread by @guerreroespejo

A 19-YO woman: a 6-month history of a slowly growing, nonscaling, nonpalpable brown patch on the left palm (A).
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DOI: 10.1056/NEJMicm2204411
#dermatology #mycology #MedEd

🔍: curvilinear brown strands — also known as pigmented spicules — that formed a reticular pattern distinct from the palmar furrows (B).

🔬palmar skin scrapings, H&E: pigmented yeast and hyphae (C).

TINEA NIGRA
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Tinea nigra is an uncommon superficial mycosis, often grouped with the dermatophytes, but caused by the melanin-producing dimorphic yeast Hortaea werneckii.
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#microbiology #dermatología

Tinea nigra:
📌a rare condition
📌found in warm and humid climates,
📌reported mainly in Central and South America,
although cases have been identified in the southern United States, Africa, and Southeast Asia.
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It most commonly manifests as a hyperpigmented patch on the palm of the hand and may be mistaken for a melanocytic lesion, such as melanoma.
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After treatment with topical butenafine, the patient’s symptoms had abated at 3 months of follow-up.
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DOI: 10.1056/NEJMicm2204411
#medicine #MedicalStudents