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Zigzag longitudinal melanonychia: a peculiar dermoscopic pattern.

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A unique zigzag pattern in longitudinal melanonychia (LM) was observed, primarily in children. This benign finding, often on the thumb, may spontaneously regress, though its link to trauma requires further study.

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Area of Science:

  • Dermatology
  • Dermoscopy
  • Nail Disorders

Background:

  • Longitudinal melanonychia (LM) poses diagnostic challenges.
  • Dermoscopy is crucial for evaluating and differentiating LM.

Purpose of the Study:

  • To describe an unusual dermoscopic pattern in patients with LM.
  • To investigate the characteristics of this specific pattern.

Main Methods:

  • Retrospective analysis of five LM patients with a 'zigzag' dermoscopic pattern.
  • Clinical and dermoscopic features were examined.

Main Results:

  • Four out of five patients were children (10-13 years old).
  • All patients had LM on their thumb.
  • One patient had a lentigo diagnosis via biopsy; two experienced spontaneous regression.

Conclusions:

  • The 'zigzag' dermoscopic pattern of LM appears common in children.
  • The pattern is considered benign, but its association with trauma is unclear.
  • Further research is needed to link histopathology with the observed dermoscopic pattern.