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Delayed telogen replacement in a boy's scalp

M Guarrera1, C Cipriani, A Rebora

  • 1Department of Dermatology, University of Genoa, Italy.

Dermatology (Basel, Switzerland)
|January 5, 1999
PubMed
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Empty spaces and vellus hairs are present in children's hair cycles, even before puberty. These findings suggest a normal resting phase, not necessarily early androgenetic alopecia (AGA).

Area of Science:

  • Dermatology
  • Trichology
  • Pediatric Hair Studies

Background:

  • Hair follicles can enter a resting phase (telogen) without immediate replacement by growing (anagen) hairs, creating temporary empty spaces.
  • The presence of these empty spaces and fine vellus hairs in prepubertal children was investigated.

Observation:

  • A longitudinal phototrichogram study monitored 60 hairs in an 8-year-old boy over 11 months.
  • The study tracked hair cycle dynamics, including the presence of terminal anagen hairs, vellus hairs, and empty follicular spaces.

Findings:

  • Terminal anagen hairs comprised 52% of the total, with 22% in regular hair cycle phases.
  • Vellus hairs and empty spaces were observed in 18% and 8% of follicles, respectively.
  • A small percentage (2%) showed an association between vellus hairs and empty spaces.

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Implications:

  • Vellus hairs and empty spaces occur physiologically in children, independent of gonadal androgens.
  • These findings suggest a 'true resting' phase in a proportion of scalp hairs.
  • Hormonal factors, particularly androgens, may influence the prevalence of these phenomena and contribute to the development of androgenetic alopecia (AGA).