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Related Experiment Videos

Changes in hair color.

D J Cline1

  • 1University of Cincinnati College of Medicine, Ohio.

Dermatologic Clinics
|April 1, 1988
PubMed
Summary
This summary is machine-generated.

Hair color changes stem from melanin shifts or structural hair alterations. Correcting underlying issues often restores normal hair color, but some factors like medications can cause persistent changes.

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Area of Science:

  • Dermatology
  • Trichology
  • Human Physiology

Background:

  • Hair color is determined by melanin production and hair structure.
  • Various factors including genetic, metabolic, nutritional, and acquired disorders can alter hair color.
  • Some hair color changes are reversible upon correction of the underlying cause.

Purpose of the Study:

  • To review the diverse causes of hair color changes.
  • To discuss the mechanisms behind drug-induced and environmentally-induced hair color alterations.
  • To highlight the relationship between hair structure, melanin, and observable hair color.

Main Methods:

  • Literature review of studies on hair color physiology and pathology.
  • Analysis of case reports and clinical observations of hair color changes.

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  • Synthesis of information on genetic, metabolic, nutritional, and external factors affecting hair pigmentation and structure.

    • Main Results:

    • Hair color changes can arise from melanin alterations or structural modifications affecting light reflection.
    • Nutritional deficiencies and medications (e.g., PABA, chemotherapy) can cause significant hair color shifts, often lightening but sometimes darkening hair.
    • External factors like copper exposure can lead to green hair, while conditions like alopecia areata may affect pigmented hairs selectively.

    Conclusions:

    • Hair color is a complex trait influenced by multiple factors beyond melanin.
    • Understanding the interplay between hair structure and pigment is crucial for diagnosing and managing hair color abnormalities.
    • Further research is needed to fully elucidate the physiology of human hair graying.