International Journal of Research in Medical Sciences | June 2021 | Vol 9 | Issue 6 Page 1758 International Journal of Research in Medical Sciences Nurasta IGNYS et al. Int J Res Med Sci. 2021 Jun;9(6):1758-1759 www.msjonline.org pISSN 2320-6071 | eISSN 2320-6012 Case Report Melanonychia striata: a case report I. Gede Narendra Yogi Swara Nurasta 1 *, Putu Anda Tusta Adiputra 2 , A. A. Krisna Dwipayana 1 INTRODUCTION Melanonychia striata or longitudinal melanonychia is an abnormal color of nail plate with pigmented (dark-brown tan black) band running in longitudinal axis of the nail. This discoloration of the nail plate is caused by increased melanin production because of increased quantity or function melanocytes in the nail matrix. Bleeding and trauma can cause increased melanin production, besides proliferation and hyperplasia of melanocyte. (A) Prevalence of melanonychia striata ranges from 1.4% in white populations and up to 77% in black populations. (B) Early detection and examination such as histopathology is needed to rule out malignancy in melanonychia striata. In this case report, we presented a case of melanonychia striata in a 12-years-old male. CASE REPORT This 12-years-old male patient presented to the Surgical Oncology Clinic of Prima Medika Hospital with one-year history of discoloration of his left ring finger nail (Figure 1). Figure 1: Melanonychia striata on the left ring nail. His nail plate turning brownish-black progressively, with no pain or swelling was present. There was no history of trauma and no discharge or itching. The patient was in good condition without taking any medication. There was no history of melanoma, melanonychia striata or other disease of the nail, and other skin diseases in the family. Dermatological examination revealed a longitudinal hyperpigmentation overlying nail plate on left ring nail 1 Department of Surgery, Prima Medika Hospital, Denpasar, Bali, Indonesia 2 Division of Surgical Oncology, Surgery,Udayana University, Sanglah General Hospital, Prima Medika Hospital, Denpasar, Bali, Indonesia Received: 05 May 2021 Accepted: 19 May 2021 *Correspondence: Dr. I. Gede Narendra Yogi Swara Nurasta, E-mail: narendra_yogi@hotmail.com Copyright: © the author(s), publisher and licensee Medip Academy. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT Melanonychia striata longitudinalis is a pigmented band in the long axis of the nail. The discoloration occured because of increase of melanin in the nail matrix. In most cases, especially in children, melanonychia striata is a benign condition. In this case report a 12-years-old male with melanonychia striata. Longitudinal excision was performed with histopathology examination to rule out malignancy and further management. Keywords: Melanonychia striata, Nail matrix, Benign DOI: https://dx.doi.org/10.18203/2320-6012.ijrms20212247