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March 1982

White PiedraReport of a Case Evaluated by Scanning Electron Microscopy

Author Affiliations

Arvi Salonen

From the Department of Dermatology and Venereology, Helsinki University Central Hospital.

Arch Dermatol. 1982;118(3):208-211. doi:10.1001/archderm.1982.01650150070030

Piedra and resulting in the formation of superficial nodules. There are two varieties—black piedra caused by Piedraia hortai and white piedra caused by Trichosporon beigelii. White piedra was first described by Beigel.1 Outbreaks of white piedra are more sporadic and less frequent than those of black piedra. White piedra occurs particularly in South America but also in central and eastern Europe, Japan, and the United States.2-5 So far, only one case has been reported in Scandinavia.6 This is a report of the second case diagnosed in Finland.

Report of a Case  In September 1978, a 27-year-old man noticed itching in his pubic and scrotal skin and small nodules along the shafts of his scrotal hair. The patient had not traveled outside Finland for several years. Two months before he first noticed the symptoms of the disease, he had had a casual sexual contact with a woman from

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