Nevus Comedonicus, a Rare Case: Dermoscopic and Histopathological Findings

Adniana Nareswari, Mardiana, Nugrohoaji Dharmawan, Oyong

2018

Abstract

Nevus comedonicus is a very rare adnexal hamartoma of pilosebaceous apparatus, with approximately 200 cases reported in the literature so far. It appears as cluster of adjacent dilated follicular openings with firm pigmented keratin plugs resembling comedones. The comedones oftentimes arranged in linear or zosteriform pattern, paralled to Blaschko’s lines. The lesions are commonly unilateral, although bilateral occurence have been reported. The predilection sites are face, neck, upper arms, chest and abdomen. We report a case of a 5-year-old boy with open brown to black comedones in a linear pattern localized on the back of the left thigh that appearing since birth. The lesions gradually increased in number and size. The plugs were firm and difficult to be extracted mechanically, leaving a big pore on the skin. Pain, itch and discharge were not obtain. There were some episodes of infection, due to manual removal done by his mother which left some hypertrophic scars. The patient was otherwise healthy, without any congenital abnormalities, extracutaneous lesion, and internal involvement. Dermoscopic examination revealed the distinctive pattern consisting of pigmented, sharply demarcated keratin plugs of 1-3 mm in diameter, some open pores, multiple structurless, various shades of brown homogenous circular areas surrounding the plugs. Punch biopsy of the lesion histologically showed an aggregation of dilated follicular infundibulum with laminated keratinous material plugging. The follicular walls were comprised of several keratinocyte layers. Based on the history taking, typical features of the lesion, dermoscopic and histopathological findings, this patient was then diagnosed with nevus comedonicus.

Paper Citation

in Harvard Style

Nareswari A., Mardiana., Dharmawan N. and Oyong. (2018). Nevus Comedonicus, a Rare Case: Dermoscopic and Histopathological Findings.In Proceedings of the 23rd Regional Conference of Dermatology - Volume 1: RCD, ISBN 978-989-758-494-7, pages 481-484. DOI: 10.5220/0008160204810484

in Bibtex Style

@conference{rcd18,
author={Adniana Nareswari and Mardiana and Nugrohoaji Dharmawan and Oyong},
title={Nevus Comedonicus, a Rare Case: Dermoscopic and Histopathological Findings},
booktitle={Proceedings of the 23rd Regional Conference of Dermatology - Volume 1: RCD,},
year={2018},
pages={481-484},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0008160204810484},
isbn={978-989-758-494-7},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 23rd Regional Conference of Dermatology - Volume 1: RCD,
TI - Nevus Comedonicus, a Rare Case: Dermoscopic and Histopathological Findings
SN - 978-989-758-494-7
AU - Nareswari A.
AU - Mardiana.
AU - Dharmawan N.
AU - Oyong.
PY - 2018
SP - 481
EP - 484
DO - 10.5220/0008160204810484