Nevus, Blue

Image and content excerpted from the VisualDx clinical decision support system.

Image of Nevus, Blue

VisualDx images show variation in age, skin color, and disease stage. VisualDx has 38 images of Nevus, Blue.

Full text and additional images for Nevus, Blue are available in the following VisualDx packages:

Pediatrics Complete

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ICD Codes

D22.9 – Melanocytic nevi, unspecified

216.9 – Benign neoplasm of skin site unspecified


The blue nevus, also known as an acquired nevus, is a developmental lesion caused by aggregates of dendritic melanocytes that lie in the deep mucosa. The depth of the pigment creates a "Tyndall effect," which is what makes the melanin pigment appear blue. Although the literature reveals a 2:1 female predilection, this may be related to female patients seeking care more often and having more cosmetic concerns than male patients. It represents approximately 1/5 to 1/4 of all intraoral melanocytic nevi. Most nevi are noticed in the 2nd to 4th decade of life and are usually asymptomatic.

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