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.


CONCLUSIONS
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.
Alhusayen
Raed
R
The Ottawa Hospital Civic Campus, Division of Dermatology, Ottawa, ON, Canada. alhusayen@gmail.com
Kanigsberg
Nordau
N
Jackson
Robert
R
D000328:Adult; D003937:Diagnosis, Differential; D006222:Hamartoma / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D017495:Hyperpigmentation / Q000175:diagnosis* / Q000473:pathology; D006983:Hypertrichosis / Q000473:pathology; D035002:Lower Extremity; D008297:Male; D012871:Skin Diseases / Q000175:diagnosis* / Q000473:pathology