Becker nevus of the leg with lipoatrophy.

Becker Nevus of the LegWith Lipoatrophy Becker nevus presentsmost commonly as a patchy hyperpigmentation with dark hairs on the upper arms or the shoulder girdle ofmale patients. Its prevalencehas beendetermined at 0.52 percent in a large cohort ofmale Frenchmilitary recruits between the ages of 17 and 26 years.1 Themale to female ratio of Becker nevus has been approximated to be about 4:1, although itmaywell beunderdiagnosed inwomenowing to less intense pigmentation andmilder or even absent hypertrichosis. An associationwith soft-tissue defects is common,manifestingmost frequently as breast hypoplasia.Danarti et al2 defined a Becker nevus syndrome as the coincidence of Becker nevus and ipsilateral breast hypoplasia, scoliosis, spina bifida, or ipsilateral limb hypoplasia. Becker nevi of the lower extremity are exceedingly rare.