To the Editor.—
Thomas J. Baker, MD (241:2207, 1979), discusses the question of shaving eyebrows before surgery in the eyebrow region. He concludes that the failure of the eyebrows to regrow is a myth. I would like to point out the basis for this "myth."1
The eyebrows will certainly regrow after they are cut or shaved. However, unlike the scalp or beard, many months are required for the return. This may be extremely distressing for the patient lacking a normal eyebrow, since there is no adjacent hair to conceal the defect.
A study of hair cycles shows the basis of this special problem with eyebrows. All human hairs have growing (anagen) and resting (telogen) phases. Each scalp hair grows for several years and then enters a resting phase for approximately three months before it is shed. At any one time 10% to 20% of the scalp hairs are in
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