This is a benign birthmark due to a collection of melanocytes at the site.


  • Flat bluish- blackish discolouration
  • This fates generally over years ( 5-6 years)


  • Most common over the lower back, buttock


  • No treatment is required as it resolves spontaneously.
  • Make sure you document it for further records.


  • Accidental injury should be ruled out.

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