A midline Becker's nevus

Becker's nevus (BN) is a cutaneous hamartoma that presents as a unilateral, hyperpigmented patch, sometimes with associated hypertrichosis.1 The genetic etiology and pathogenesis of BN are not clear; it is currently considered a sporadic condition.2 Histopathology of these lesions shows acanthosis, basilar hyperpigmentation, and occasionally, hyperplasia of the underlying smooth muscle.3 There is no established treatment.1 Clinical appearance, morphology, and distribution often raise suspicion for BN, yet there have been an increasing number of variants and associations published in recent years.

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