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Picking a Side: Preferential Laterality in Scalp Hair Density.

Amanda N Duong1, Colin Kincaid1, Celine Phong1

  • 1Department of Dermatology, University of California, Irvine, CA, USA.

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This study found no overall preference for scalp hair growth laterality in healthy individuals. However, some groups showed a tendency for denser hair growth on one side, suggesting potential influences beyond genetics.

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Area of Science:

  • Dermatology
  • Trichology
  • Human Biology

Background:

  • Clinical observations suggest potential scalp hair density laterality.
  • Limited research directly quantifies differences in scalp hair density on either side.
  • Understanding hair growth patterns is crucial for diagnosing and treating hair loss conditions.

Purpose of the Study:

  • To investigate if scalp hair growth exhibits preferential laterality in healthy individuals.
  • To determine if a right or left side preference exists for denser hair growth.
  • To contribute data on normal variations in scalp hair distribution.

Main Methods:

  • Digital trichoscopy was used to image the scalps of healthy subjects.
  • Bilateral temporal scalp photographs were acquired at a university dermatology clinic.
  • Quantitative analysis of hair density was performed using specialized trichoscopy software.

Main Results:

  • No overall significant preference for right or left scalp hair laterality was observed in the general study population.
  • A notable tendency for hair laterality was present in individuals identifying as Asian or Hispanic.
  • Statistical significance for hair laterality was not achieved in African American or Caucasian subjects.

Conclusions:

  • While no universal side preference for hair growth was found, many individuals exhibit asymmetrical hair density.
  • Genetic factors may influence hair laterality, but behavioral and environmental factors could also play a role.
  • Further research is warranted to explore the multifactorial causes of scalp hair laterality.