Fig. 15

Benign acral lesions which show dermoscopic features mimicking the parallel ridge pattern. There are several benign conditions which exhibit dermoscopic features mimicking the parallel ridge pattern, such as the so-called black heel (calcaneal petechia), known as the dermoscopic features of the “pebbles on the ridges” (a) and acral pigmented macules due to chemotherapeutic drugs such as 5-fluorouracil (b) (Fig. 15a was reproduced with permission from Saida and Koga 2013)