Dermatology Book

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Halo Nevus

Aka: Halo Nevus, Halo Nevi
  1. Pathophysiology
    1. Compound Nevus or Dermal Nevus
    2. Halo region is depigmented, without Melanocytes
    3. T-Lymphocyte mediated depigmentation
  2. Epidemiology
    1. Onset in teen years
    2. Incidence: 1%
  3. Signs
    1. White, symmetric round halo surrounding a nevus
    2. Distribution
      1. Trunk is most typical
      2. Always spares the palms and soles
  4. Associated Conditions
    1. Vitiligo risk may be increased
  5. Course
    1. Repigmentation may occur spontaneously over years
  6. Prognosis
    1. Rare malignant transformation (typically predictable by atypical features)
  7. Reference
    1. Habif (2003) Clinical Dermatology, 4th ed.. Mosby, p. 773-813

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