Which histologic findings are characteristic of telogen effluvium?

Updated: Sep 17, 2020
  • Author: Elizabeth CW Hughes, MD; Chief Editor: Dirk M Elston, MD  more...
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Histologic findings in telogen effluvium are subtle and are most easily seen on transverse sections of a punch biopsy. The number and density of hair follicles is normal, but an increased percentage of the hair follicles are in telogen or catagen phase. If more than 25% of the follicles are in telogen phase, the diagnosis is confirmed. The percentage of telogen hairs generally should not be higher than 50%.

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