Dermoscopic rainbow pattern in blue nevus

A 31-year-old HIV positive male presented with a two-year history of a slowly growing, 2 cm, asymptomatic, solitary blue-gray nodular lesion on dorsum of right foot (Figure 1a). Dermoscopic examination revealed a well-circumscribed lesion with homogenous blue-grayish globular pattern, scaly surface and striking color changes of yellow, green, purple and pink resembling the colors of a rainbow centrally in polarized dermoscopy (Figure 2a [Dermlite 4, 3Gen, San Juan Capistrano, CA]). The lesion was completely excised with 3 mm clear margins, and histopathological examination was consistent with blue nevus (Figures 3, 4). A 59-year-old male presented with a five-year history of a 2 cm, black nevus on his right foot, which was disturbing while walking with no history of changing (Figure 1b). He was healthy and had no complaint from this lesion. Dermoscopic examination revealed a wellcircumscribed blue-gray lesion and striking color changes of yellow, green, purple and pink resembling the colors of a rainbow centrally in polarized dermoscopy (Figure 2b). His lesion was completely excised, and histopathological examination revealed heavily pigmented melanocytes in dermis. Dermoscopic rainbow pattern in blue nevus