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Vellus Hairs

Rob (PHH)

Vellus hairs are hairs that do not contain pigment, and do not grow long enough or wide enough to produce cosmetic differences in hair quality. Specifically, vellus hairs:

  • May not contain pigment
  • Are ≤ 40µm in diameter
  • Are ≤30mm in length

In androgenic alopecia, terminal hairs miniaturize over a number of hair cycles until they become vellus hairs. Here is an example of terminal, miniaturizing, and vellus hairs provided by Dr. Donovan:


  • vellus
  • non-terminal
  • vellus hair
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