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Related Experiment Video

Updated: Dec 21, 2025

Author Spotlight: Developing Precise and Clinically Relevant Models for Studying Secondary Degeneration in Traumatic Optic Neuropathy

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Published on: November 29, 2024

Interdigital Tinea Nigra.

Marina K Ibraheim¹, Michelle A McNally¹, Jaime Tschen²

¹Dermatology, John P. and Kathrine G. McGovern School of Medicine, University of Texas Health Center, Houston, USA.

|May 12, 2020

Summary

This summary is machine-generated.

Tinea nigra is a fungal infection causing dark skin patches, often mistaken for melanoma. Diagnosis via KOH prep and Wood

Keywords:

dermatomycosis interdigital koh preparation tinea nigra

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Area of Science:

Dermatology
Mycology
Infectious Diseases

Background:

Tinea nigra is a rare superficial fungal infection caused by *Hortaea werneckii*.
This fungus produces a melanin-like pigment, leading to dark skin lesions.
Lesions often mimic benign or malignant pigmented skin conditions.

Observation:

A 52-year-old woman presented with a painless, asymptomatic dark brown patch on her foot.
The lesion's appearance raised suspicion for melanoma or nevi.
Initial diagnostic steps included Wood's lamp examination and potassium hydroxide (KOH) preparation.

Findings:

KOH preparation confirmed the presence of *Hortaea werneckii*.
Wood's lamp examination also supported the diagnosis of fungal infection.
The patient's presentation mimicked more serious dermatological conditions.

Implications:

Non-invasive diagnostic methods like KOH prep are crucial for identifying tinea nigra.
Prompt and accurate diagnosis prevents unnecessary invasive procedures.
Effective topical antifungal treatment leads to complete resolution of tinea nigra.