The “Rainbow Pattern” and “Crystalline Structures” in a Post-Traumatic Scar

Dermoscopy is a noninvasive diagnostic technique, which is performed in vivo and increases the possibility of diagnosis in both pigmented and non-pigmented lesions. We report the case of a patient with a scar of particular characteristics: the dermoscopic examination showed a “rainbow pattern” as well as “crystalline/chrysalis structures”. The term "rainbow pattern" refers to the display of multiple colors and was described primarily in Kaposi's sarcoma (KS) although lately it has also been reported in other lesions, including scars. The “crystalline/chrysalis structures” are bright white lines, visible only with polarized light dermoscopy. They have been related to dermal fibroplasia, although this has not been properly determined yet.