Knotting of scalp hair.
D000349:Africa; D044383:Black People; D006197:Hair / Q000473:pathology*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D012871:Skin Diseases / Q000473:pathology*; D014481:United States; D014900:West Indies; D044465:White People; D001741:Black or African American