# Congenital plaque-type blue nevus on the palm of the right hand: a rare case report

## TL;DR

A 10-year-old girl had a rare congenital blue nevus on her palm, which was surgically removed and showed no recurrence after 5 years.

## Contribution

Reports a rare congenital case of plaque-type blue nevus on the palm with long-term follow-up and histopathological confirmation.

## Key findings

- The patient had congenital PTBN on the right palm with a tingling sensation.
- Histochemical analysis showed pigmented melanocyte proliferation in dermis and subcutis.
- Surgical excision led to no recurrence over 5 years.

## Abstract

Plaque-type blue nevus (PTBN) is a rare variant of blue nevus that mostly involves the breast, head, neck, trunk, and, rarely, the hand and palm. In this study, we report a rare case of congenital PTBN involving the right palm since birth. A 10-year-old girl presented to our department with plaque in her right palm accompanied by a tingling sensation for 1 month. Histochemical analysis indicated a heavily pigmented melanocyte proliferation in the dermis, subcutis, and fascia. The patient was diagnosed with congenital PTBN and underwent surgical excision. No recurrence was observed during a 5-year follow-up.