Dr P.C. Das is a senior practicing clinical dermatologist at Purnea and Katihar districts of Bihar, India. He has graduated and post graduated from Patna Medical College, Patna University, India, in 2000. He has been practicing Clinical dermatology, Lasers and Dermatosurgery for over two decades. He has participated and presented papers in international, national and regional dermatology conferences and organized some of them. His fields of special interest are newer drugs in leprosy and clinical dermatology. Dr Piyush Kumar finished his post-graduation in Dermatology from Medical College and Hospital, Kolkata in 2011 and was judged the best outgoing university medical graduate in Dermatology. He received many scholarships during and after his post-graduation to attend and present papers at National and International conferences. He has published more than 150 papers in indexed National and International journals and works as a reviewer for various National and International specialty journals. He has contributed many chapters in various books and has co-edited ""Nail Disorders: A Comprehensive Approach"", ""Clinical Cases in Disorders of Melanocytes"" and ""Clinical Cases in Leprosy"". His areas of interest are Clinical dermatology, Dermatopathology, Nail disorders and Genital dermatoses.