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Nevoid hypertrichosis and hypomelanosis.

Olivia López-Barrantes1, Antonio Torrelo, Imelda G Mediero

  • 1Department of Dermatology, Hospital del Ni o Jes s, Menéndez Pelayo 65, 28009-Madrid, Spain.

European Journal of Dermatology : EJD
|December 3, 2002
PubMed
Summary
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This case study presents a girl with nevoid hypertrichosis and linear hypopigmentation. The unusual skin lesion patterns suggest a potential instance of twin spotting.

Area of Science:

  • Dermatology
  • Human Genetics
  • Developmental Biology

Background:

  • Blaschko's lines represent patterns of cellular migration during embryonic development.
  • Nevoid hypertrichosis is a congenital condition characterized by excessive hair growth in localized areas.
  • Linear hypopigmentation refers to streaks of lighter skin color following specific dermatomal patterns.

Observation:

  • A pediatric patient presented with multiple lesions of nevoid hypertrichosis.
  • These hypertrichotic lesions were accompanied by linear hypopigmentation.
  • The hypopigmentation followed Blaschko's lines, indicating a mosaic pattern of genetic expression.

Findings:

  • The coexistence of nevoid hypertrichosis and linear hypopigmentation along Blaschko's lines is rare.

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  • No extracutaneous anomalies were observed in the patient.
  • The observed pattern supports the hypothesis of twin spotting, a phenomenon involving post-zygotic mutations leading to somatic mosaicism.

    • Implications:

    • This case expands the known clinical manifestations associated with twin spotting.
    • Understanding such mosaic conditions aids in diagnosing and managing rare dermatological disorders.
    • Further research into the genetic mechanisms underlying twin spotting could offer insights into early embryonic development and pigmentary disorders.