Linear and whorled nevoid hypermelanosis (LWNH) is characterized by swirls and streaks of macular hyperpigmentation along the Blaschko line and usually appears within the first 2 years of life without preceding inflammation or atrophy.1 It is occasionally associated with chromosomal abnormalities and anomalies of other organs.2
Hong SP, Ahn S, Lee W. Linear and Whorled Nevoid Hypermelanosis: Unique Clinical Presentations and Their Possible Association With Chromosomal Abnormality inv(9). Arch Dermatol. 2008;144(3):415–416. doi:10.1001/archderm.144.3.415
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