Cureus, Interdigital Tinea Nigra

Tinea nigra is an uncommon superficial dermatomycosis precipitated by Hortaea werneckii, a halophilic and halothermic yeast-like fungus capable of producing a melanin-like substance. This pathogen infiltrates the stratum corneum in the setting of microtrauma and produces an asymptomatic brown to black macule or patch that appears similarly to melanocytic nevi or melanoma. We present a case of a 52-year-old woman who presented to clinic several months after developing a painless, nonpruritic dark brown patch in her left foot inside the fourth toe web. The coloration and location of this lesion would typically prompt biopsy; however, Wood’s lamp examination and potassium hydroxide (KOH) preparation were pursued first and demonstrated evidence of infection by H. werneckii. The patient was treated with topical clotrimazole cream and miconazole powder for one month, and her lesions cleared completely. Her lesions did not recur at her three-month follow-up appointment.

Dermoscopy of skin infestations and infections (entomodermoscopy) - Part II: viral, fungal and other infections. - Abstract - Europe PMC

Tinea nigra: a rare imported infection - Rezusta - 2010 - Journal of the European Academy of Dermatology and Venereology - Wiley Online Library

A Special Tinea Nigra Caused by Curvularia lunata: Case Report and Literature Review

File:Tinea nigra.jpg - Wikimedia Commons

Tinea Nigra: Symptoms, Appearance, Causes, Diagnosis

Tinea nigra presentation

Tinea Nigra

SciELO - Brasil - Spontaneous cure in a case of Tinea nigra Spontaneous cure in a case of Tinea nigra

Cureus, Cutaneous Fungal Infections in Patients Experiencing Homelessness and Treatment in Low-Resource Settings: A Scoping Review

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Dermatophytes/Tinea Infections

Tinea nigra - Wikipedia