Dermatology: Practical and Conceptual Quiz | Dermatol Pract Concept 2014;4(3):15 75 DERMATOLOGY PRACTICAL & CONCEPTUAL www.derm101.com Below find the answer to the quiz by Costa et al. Presented in the previous issue of Dermatology Practical & Conceptual (http:dx.doi.org/10.5826/dpc0402a13). Diagnosis Trichoepithelioma Congratulations to Dr. Napolitano, who was the first to send us the correct answer! An atypical pigmented lesion—Answer Claudia Costa1, Franco Palmisano1, Massimiliano Scalvenzi1 1 Department of Dermatology, University of Naples Federico II, Naples, Italy Citation: Costa C, Palmisano F, Scalvenzi M. An atypical pigmented lesion. Dermatol Pract Concept. 2014;4(3):15. http://dx.doi. org/10.5826/dpc.0403a15. Copyright: ©2014 Costa et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Corresponding author: Massimiliano Scalvenzi, via Pansini 5, 80129 Naples. Italy. Email: scalvenz@unina.it