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368 Ann Dermatol Received January 19, 2017, Revised May 8, 2017, Accepted for publication June 5, 2017 Corresponding author: Hwa Jung Ryu, Department of Dermatology, Korea University Ansan Hospital, 123 Jeokgeum-ro, Danwon-gu, Ansan 15355, Korea. Tel: 82-31-412-5186, Fax: 82-31-412-4208, E-mail: [email protected] ORCID: https://orcid.org/0000-0003-2136-4682 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/ licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright © The Korean Dermatological Association and The Korean Society for Investigative Dermatology Fig. 1. (A) Flesh-colored plaque with mildly verrucous surface on the scalp. (B) Papillomatosis is accompanied by many sebaceous glands (H&E, ×40). (C, D) More prominent papillomatosis is seen on the left. On the right are opening to the epidermis layer and several cystic invaginations extending into the dermis. Close-up view of the lower portion reveals features of decapitation secretion including cellular debris in the lumina (H&E; C: ×40, D: ×200). (E) A group of atypical squamous cells with peripheral palisading pattern within epidermis (H&E, ×100). https://doi.org/10.5021/ad.2018.30.3.368