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Abstract
Becker nevus also known as pigmented hairy epidermal nevus, is a cutaneous hamartoma localized on upper extremities and trunk. It is characterized by a unilateral, hyperpigmented patch with irregular border and hypertrichosis. In most cases, the lesions are more common in males than in females and appear in late childhood or adolescence. The etiology of Becker nevus remains uncertain but it is thought that there is a relationship between androgen metabolism and Becker nevus. There have been rare reports of cases with atypical location such as the face and lower extremities. Here we report a case of a young boy with Becker nevus localized on the left cheek with asymmetrical growth of beard hair. Becker nevus must be kept in mind in the differential diagnosis of hyperpigmented lesions with hypertrichosis which are located on the face.
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