Dear Editor, Becker nevus (BN) is characterized by a unilateral lesion consisting of hypermelanosis and hypertrichosis. It develops on the upper torso, shoulders, or arms, especially of male adolescents. Most cases are acquired, and the time of onset varies from infancy to adulthood. Although the etiology of this nevus is not yet known, an association with the expression of androgen receptors i...

We describe a 10-year-old Japanese girl presenting linear alopecia on the scalp and forehead. Histological examination showed fat degeneration with mucin deposit and periappendageal infiltrate of mononuclear cells. We diagnosed her as having linear lupus erythematodes profundus with a linear configuration following the lines of Blaschko.