Description

Unilateral nevoid acanthosis nigricans (UNAN) is a rare, benign, autosomal dominant form of acanthosis nigricans that manifests at birth, or during childhood or puberty. The salient features include localised distribution, benign course, lack of systemic and tumour associations, and occurrence due to somatic mosaicism of postzygotic gene mutation.1 Rare sites of involvement include the face, scalp, chest, periumbilical area2 and submammary region.3 An 18-year-old man presented with a 3-year history of …