Hair Disorders Induced by External Factors

  • Becky S. LiEmail author
  • Marcel C. Pasch
  • Howard I. MaibachEmail author
Reference work entry


  • External factors may result in hair loss, increased hair growth, or changes in the color and texture of the hair.

  • External factors responsible for hair loss are drugs, radiation, traction, fungi, pesticides, plant toxins, heavy metals, and several other chemicals.

  • Several groups of drugs may be responsible for unintentional induction of hair growth.

  • Texture and color of hair may be changed by drugs, metals, and ultraviolet and other radiation.

  • Full recovery is the rule after elimination of the responsible factor.


Alopecia Hair loss Hair disorder Anagen Catagen Telogen Hirsutism Hypertrichosis 


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Howard University College of MedicineWashingtonUSA
  2. 2.Department of DermatologyRadboud University Nijmegen Medical CentreNijmegenThe Netherlands
  3. 3.Department of DermatologyUniversity of CaliforniaSan FranciscoUSA

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