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Persistent perpendicular pigmentation: a peculiar but specific type of persistent nevus.

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Persistent nevi, often mistaken for melanoma, are benign growths. Their unique pigmentation pattern confined to surgical scars is a key diagnostic clue.

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Area of Science:

  • Dermatology
  • Pathology

Background:

  • Persistent nevi are common in clinical and dermatopathology practice.
  • These lesions can clinically and microscopically resemble melanoma but are benign.

Observation:

  • Persistent nevi may display asymmetry and irregular features, raising concern for melanoma.
  • Pigment restriction to the surgical scar is a crucial diagnostic indicator.
  • Linear patterns along skin tension lines (Langer lines) can be observed in some persistent nevi.

Findings:

  • The study reviews clinical and histologic features of persistent nevi.
  • A case with striking perpendicular pigmentation confined to a scar is presented.
  • This pattern is reassuring and aids in diagnosis.

Implications:

  • Understanding the characteristic features of persistent nevi can prevent misdiagnosis of melanoma.
  • Recognition of scar-confined pigmentation is vital for accurate dermatopathological assessment.
  • This knowledge aids clinicians in reassuring patients about benign lesion behavior.