Linear and whorled nevoid hypermelanosis: A case report with dermoscopic findings

Abstract

The girl had normal developmental milestones and systemic examination was within normal limits On dermoscopy, the whorled patches on the trunk showed numerous brownish rings and curved lines and a few brownish streak-like lines [Figure 2]a, while the linear patches on the legs showed short brownish streak-like lines arranged in a parallel manner and a few curved brownish lines [Figure 2]b. Another dermoscopic finding present in both linear and whorled lesions consisted of focally distributed hypopigmented dots corresponding to perifollicular areas [Figure 2]a and [Figure 2]b.{Figure 1}{Figure 2} A skin biopsy from a lesion on her left thigh confirmed the clinical diagnosis of linear and whorled nevoid hypermelanosis by revealing increased basal layer pigmentation without melanocytosis; there was no pigment incontinence in the dermis [Figure 3]. [4] The dermoscopic features described in our case are reminiscent of the "parallel" pattern. [...]the predominance of linear streaks on the linear patches on the legs, and rings/curved lines on the whorled lesions of the back may be justified by the well-known regional variations in morphology of Blaschko's lines.