Nevus. Medium power photomicrograph showing nests of nevus cells in the connective tissue subjacent to the stratified squamous epithelium. Melanin pigment is present in some of the cells. Hematoxylin and eosin stain.

Nevus. A thickened, firm, nontender, well circumscribed, dark brown surface lesion on the right hard palate.

Nevus. High power photomicrograph showing nests of nevus cells subjacent to the stratified squamous epithelium. The nevus cells demonstrate nuclei that are uniform in size, shape and staining. Some of the cells contain melanin pigment. Hematoxylin and eosin staining.