Complete replacement of all hairs on the human head with new hairs, through the hair cycle, takes about 5–7 years. The anagen stage lasts several years, the catagen a few weeks, and the telogen several months. Other hair cycles, such as those for the eyelash and the axilla, average 150 and 123 days, respectively (Fig. 7.1).
KeywordsHair Growth Sebaceous Gland Scalp Hair Dermal Papilla Anagen Stage
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