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Diseases of Cutaneous Appendages
Anagen Phase
Catagen Phase
Telogen Phase
Hair basics
Hair follicle formation:
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Nine weeks’ gestation, follicles seen
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By 18th week, hair on entire body (except palms/soles/genitalia)
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Growth rate = 1 mm every 3 days (or 0.35–0.37 mm/day), or 1 cm per month
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Lose an average of 50–100 hairs per day
Pigment predominantly in cortex layer:
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Eumelanin = brown/black hair
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Pheomelanin = red/blonde hair: red hair often has variant to MC1R gene (melanocortin receptor)
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