Becker's nevus among siblings

[8] It is believed that androgens may play a role in Becker's melanosis as evidenced by its peri-pubertal development, male preponderance, hypertrichosis, acneiform lesions within the patch and increase in androgen receptors in involved skin. [2] Becker nevus syndrome includes the association of Becker's nevus with one or more of the following: unilateral hypoplasia of the breast, aplasia of the ipsilateral pectoralis major muscle, ipsilateral limb shortening, localized lipoatrophy, spina bifida, scoliosis, pectus carinatum, congenital adrenal hyperplasia and an accessory scrotum.