Large congenital melanocytic nevus

What is Large congenital melanocytic nevus?

A large, or giant, congenital melanocytic nevus (LCMN or GCMN) is a pigmented skin lesion of more than 20 cm - or 40 cm- respectively, projected adult diameter, composed of melanocytes, and presenting with an elevated risk of malignant transformation.

Other condition names

  • Congenital pigmented nevus
  • GMN
  • Giant congenital melanocytic nevus
  • Giant pigmented hairy nevus
  • LCMN

Inheritance type

Not applicable


  • Europe: 1-9 in 100,000

Age of Onset

  • Infancy
  • Neonatal
Orphadata: Free access data from Orphanet. © INSERM 1999. Available on "". Data version 1.3.16 / 4.1.7.