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The article examines the characteristics of pili annulati. Pili annulati, or ringed hair, is a very rare anomaly perhaps due to an inherent error of growth of the hair. Bright and dark bands characterize the hair anomaly, which may occur sporadically or may be familial, with periodic occurrence every 0.5-mille meter along the hair shaft. The bright bands are due to the air-filled cavities within the hair, which scatter the light. Usually, there are no clinical problems with hair growth. An adjunctive morphologic anomaly, the dishomogeneity of the cuticular scale distribution along the hair shaft.