Dermoscopic Features in Seborrheic Keratoses; What is the Value of the False Melanocytic Features?

Aim: We aimed to search the dermoscopic features in seborrheic keratoses, especially the false melanocytic ones. Method: Two-hundred and fourteen lesions from 45 patients (27-85 age range, 18 women) were included in the study. Dermoscopic images of all lesions were evaluated and histopathological examination was performed when necessary. Results: The dermoscopic features observed were pseudofollicular openings (72%), milia-like cysts (66%), brain-like appearance (32.2 %), vascular structures (23%), ?fat fingers? (10.3%) and exophytic papillary structures (5.1 %). False melanocytic features were observed in 30 lesions (14 %). These were globule-like structures (9.4%), pigment network-like structures (2.4%), blotch (1.4 %), and blue-white structure (0.9 %). In 7 lesions (3.3%), it was not possible to rule out a melanocytic lesion. Histopathological examination was performed in forty-four lesions. Conclusion: This study indicated that although false melanocytic features may be observed in seborrheic keratoses, the lesions difficult to differentiate from melanocytic lesions are quite rare. In seborrheic keratoses, blotch and blue-white structure have been described for the first time in this study. In addition, ?fat fingers?, a recently described feature, has been examined for the first time in this study and found to be in lower incidence compared with the primary report