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February 2004

Dermoscopy of Keratinocytic Neoplasms: Subpatterns of Seborrheic Keratoses

Author Affiliations


Arch Dermatol. 2004;140(2):260. doi:10.1001/archderm.140.2.260

THE LESIONS SHOWN ARE FROM THE LEFT anterior lower leg of a 52-year-old white man (Figure 1), the back of a 51-year-old white woman (Figure 2), and the left upper abdomen of a 51-year-old white woman (Figure 3) (size bar, 5 mm). All 3 of these lesions reveal a similar pattern. They are well demarcated from the surrounding skin and the bulk of the lesion has a foggy brown quality punctuated by crisp brown-black circular areas (comedolike openings) and less well-defined white dots (milialike cysts). This pattern is common for seborrheic keratoses. The underlying disease process resulting in these lesions remains unknown. However, there clearly is a loss of normal keratinocyte growth regulation. In lesions with this pattern melanin also appears to be accumulated.