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Becker’s nevus syndrome: A new case series

Becker’s nevus syndrome (BNS) is a rare epidermal nevus syndrome characterized by Becker’s nevi and other, often unobtrusive, systemic symptoms and/or skin lesions, often ipsilateral. A Becker’s nevus (BN) is a hamartoma that is unilateral, hyperpigmented, and often hairy. Systemic symptoms typically involve breast gland hypoplasia and skeletal and muscular disorders. Herein, we describe three rare cases of Becker’s nevus syndrome. In the first case, the BN coexisted with ipsilateral breast gland hypoplasia; in the second case, the BN coexisted on both sides with breast gland hypoplasia and keratosis pilaris only in the left antecubital region and with scoliosis; in the third case, we found two Becker’s nevi in the left and right hip area associated with hypoplasia of the third canine tooth on the right side and with scoliosis. Our three cases were sporadic and all occurred in males. Coexisting symptoms of BN were found accidentally. We describe two new coexisting symptoms: atypical keratosis pilaris and hypoplasia of the canine teeth.