Key message
Tinea nigra (TN) is a superficial fungal infection caused by Hortaea (Phaeoannellomyces) werneckii, formerly called Cladosporium werneckii or
A 17-year-old boy presented with a 7-mm brown macule on the fourth finger on his right palm evolving for 6 months, with clearly defined margins and no associated complaints (Fig 1).
Dermoscopic examination found a brown, fine-dotted, and granular structure overlapping an amorphous light brown macule. These wispy brown strands, or pigmented spicules, represent pigmented hyphae in the stratum corneum. Like almost all other case reports, the pigment did not follow or respect the dermatoglyphic furrows and ridges (Fig 2). Tinea nigra (TN) is a superficial fungal infection caused by Hortaea (Phaeoannellomyces) werneckii, formerly called Cladosporium werneckii or Key message
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