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.

Tinea Nigra Clinical Presentation: History, Physical Examination, Complications

Dermoscopy revealing a case of Tinea Nigra. - Abstract - Europe PMC

Figure 4 from Tinea nigra by Hortaea werneckii, a report of 22 cases from Mexico

Tinea nigra - an overview

Tinea nigra - Wikipedia

PPT) Tinea DR ND KHAN

Dermatoscopy in the diagnosis of tinea nigra

Tinea Nigra: Symptoms, Appearance, Causes, Diagnosis

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