Melanocytic nevus.

Thompson L.
Ear Nose Throat J. 2006 Dec;85(12):804.
FIRST PARAGRAPH: Nevus is an umbrella term used to describe a host of benign melanocytic growths. Most nevi are small (<0.6 cm), well demarcated, circumscribed lesions with variable pigmentation. Histologically, they are symmetrical.
PubMed ID: 17240699
Article Size: <1 MB