# A Rare Presentation of Becker’s Nevus on the Lower Extremity With Dermoscopic Features: A Case Report

## TL;DR

This case report describes a rare instance of Becker’s nevus on a teenager’s lower leg, highlighting its unusual location and dermoscopic features.

## Contribution

The paper presents a rare case of Becker’s nevus on the lower extremity with detailed dermoscopic findings.

## Key findings

- Becker’s nevus was observed on the lower extremity of a 17-year-old boy, an uncommon location for this condition.
- Dermoscopic features such as pigment networks and hypertrophic follicles were consistent with typical BN characteristics.
- No malignant transformation was noted, and treatment was not pursued due to lack of cosmetic concern.

## Abstract

Becker's nevus (BN) is a unilateral epidermal hamartoma that presents as a hyperpigmented and hypertrichotic lesion, typically appearing during adolescence. While BN frequently occurs on the upper trunk and proximal upper limbs, its manifestation on the lower limb is rare. Dermoscopy serves as a helpful diagnostic tool alongside clinical examination, revealing features such as pigment networks, hypertrophic follicles, and distinct skin furrows. We presented a case of a 17-year-old boy with typical dermoscopic features of BN located on the lower extremity. Although there is no definitive treatment for BN, most therapeutic interventions are primarily aimed at improving cosmetic appearance. In cases like ours, where the patient is not concerned about the cosmetic aspect, treatment may not be necessary. Laser therapies, in particular, have been shown to be effective in treating BN. There are no reported cases of malignant transformation in the literature. While associations with conditions such as malignant melanoma, vitiligo, and various skin appendages have been documented in case reports, BN is generally considered a benign clinical condition in most patients.