Longitudinal pigmentation of the nails.
D000293:Adolescent; D000307:Adrenal Gland Diseases / Q000150:complications*; D044466:Asian People; D044383:Black People; D005260:Female; D006801:Humans; D008297:Male; D009262:Nails; D010858:Pigmentation; D010859:Pigmentation Disorders; D012737:Sex Factors