Becker nevus on the lower limb: case report and review of the literature

BACKGROUND: Becker nevus is a hamartoma with brown hyperpigmentation and hypertrichosis that usually affects young males. It has a predilection for the upper half of the trunk and proximal upper extremity. OBJECTIVE: This is a case report of a 38-year-old male with a Becker nevus without hypertrichosis on the lower limb and a review of the literature. RESULTS: Including our case report, 12 cases of Becker nevus on the lower limb were identified in the English literature (8 males and 4 females). It has never been reported below the knee. In males, the lesion was not associated with other anomalies, and all but two showed hypertrichosis (six of eight). In 50% (two of four) of women, it was associated with localized lipoatrophy. In one woman, it presented without hypertrichosis. CONCLUSION: The presence of Becker nevi on the lower limb is unusual, and hypertrichosis is not always a feature. Larger studies are required to look into the true prevalence of this presentation and its prognostic value as a marker for other anomalies.