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Effects of hormones

 

Androgens: The growth of hair, except that on scalp, is under the major influence of androgens. At puberty, androgen converts vellus hair follicles to terminal follicles in axillary and pubic region. Growth of coarse hair occurs in the beard, moustache, abdomen and chest. Recession of frontal hair starts due to gradual replacement of terminal hair by vellus hair, which starts at puberty. In women with virilizing syndromes, facial hair grow in male-dominant area and scalp may show male–pattern alopecia. Administration of an anti-androgen like cyproterone acetate, spironolactone or flutamide reverses these effects.

 

Thyroid hormones: They enhance the onset of the follicular cycle of activity, but retard the rate of hair growth.

 

Estrogens: It inhibits the onset of follicular activity & retains the club hair in the follicle. It increases the rate of growth. The former action is responsible for postpartum alopecia resulting from the loss of retained telogen hair as the estrogen level falls.

 

Ageing: Follicle decreases in size, shaft diameter reduces, pigment is gradually diminished and lost.

 

PARTS OF THE BODY

RATE OF GROWTH

Scalp

0.45mm/day

Beard

0.35mm/day

Extremities

0.25mm/day

Forehead (vellus hair)

0.03mm/day

 

 





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