What is Becker’s Nevus

Becker’s Nevus
Origin: a developmental anomaly, lacks nevus cells
Onset: lesions appear in adolescent men
Site: on the shoulder, submammary area, and upper and lower back
Appearance: either a brown macule, a patch of hair, or both; nonhairy lesions may later develop hair. The border is irregular and sharply demarcated.
Size: varies in size and may enlarge to cover the entire upper arm or shoulder
Treatment: usually too large to remove by excision. The hair may be shaved
Progression: Malignancy has never been reported
Associated lesions: other developmental defects such as ipsilateral hypoplasia of breast and skeletal anomalies including scoliosis, spina bifida occulta, or ipsilateral hypoplasia of a limb in Becker nevus syndrome.