Dermatoscopic shiny white structures in benign cutaneous tumours.

The dermatoscopic characteristics of shiny white structures (SWS) in malignant skin tumours are well described, but data on benign skin neoplasms are scarce. To evaluate dermatoscopic features of SWS in common benign tumours, we reviewed our database for histopathologically confirmed cases. The dermatoscopic images were evaluated for the presence of any type of SWS. Those images with SWS were further analyzed for their quantity, distribution and shape. Of 2420 evaluated benign tumours, 357 (14.8%) displayed SWS. The highest frequencies were observed in pyogenic granuloma (62/100, 62.0%), angioma (63/113, 55.8%) and adnexal tumours (42/84, 50.0%). The lowest frequency was found in common nevi (16/1032, 1.6%) and solar lentigo (0%). The presence of SWS was not associated with sex or anatomic location. SWS were usually diffuse and multiple. SWS may be present in a broad spectrum of benign tumours. Therefore, they should not be considered as de-facto indicators of malignancy.

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