JAMES M.RICHNIKMD, PhD
THE LESIONS shown are from the back of a 41-year-old white man (Figure 1), the back of a 32-year-old white woman (Figure 2), and the back of a 35-year-old white woman (Figure 3) (size bar, 5 mm). All 3 lesions reveal a relatively similar pattern. The lesions have very dark brown coloration and the network pattern is clearly defined and uniform at the edges. Central network structures are less clearly visualized and scattered hypopigmented foci are noted. This pattern is one pattern common in "dysplastic" (atypical) nevi. Theoretically, this pattern could be caused by a clone of melanocytic cells that aberrantly proliferate and differentiate in the epidermis and papillary dermis yielding prominent epidermal pigmentary patterns.
Grichnik JM. Dermoscopy of Melanocytic NeoplasmsSubpatterns of Dysplastic/Atypical Nevi. Arch Dermatol. 2003;139(9):1238. doi:10.1001/archderm.139.9.1238