Becker's melanosis and hypoplasia of the breast and pectoralis major muscle.
Becker's melanosis can be associated with hypoplastic abnormalities. In our patient (the first case report), it occurred in association with an absent pectoralis major muscle. Although more common in males, this patient demonstrates that Becker's melanosis can occur in females and may be congenital.
D000293:Adolescent; D001940:Breast / Q000002:abnormalities*; D005260:Female; D006801:Humans; D008548:Melanosis / Q000150:complications* / Q000151:congenital / Q000473:pathology; D010369:Pectoralis Muscles / Q000002:abnormalities*; D012867:Skin / Q000473:pathology