V Gupta1, B K Khaitan2, S Patra1, R Yadav3. 1. Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India. 2. Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India. binodkhaitan@hotmail.com. 3. Department of Pathology, All India Institute of Medical Sciences, New Delhi, India.