To the Editor.—
Hair casts (HCs), the disorder of asymptomatic, small, grayish-white, freely movable formations, resembles louse eggs and encircles the hair shaft. Only 37 cases have been reported in the literature.1-3 As the pathophysiology and origin of HC is poorly understood, 3548 students of kindergarten and primary and middle school age (3 to 18 years) were examined from February through May 1991. There were 1073 patients with HC in a sample of 1322 girls who plaited their hair for a period of 6 months to 10 years. No HCs were found among the other 2226 subjects who did not plait their hair (1806 boys and 421 girls). For further insight into the relationship between the histopathologic findings of HC and plaiting, hair samples from two girls (both of whom were 12 years of age) were studied by light and scanning and transmission electron microscopic investigations. A normal 12-year-old
Shieh X, Yi X. Hair Casts: A Clinical and Morphologic Control Study. Arch Dermatol. 1992;128(11):1553–1554. doi:10.1001/archderm.1992.01680210133030
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