Primary Fluorescence of Normal and Pathologic Keratin**From the Medical Service, Section of Dermatology, Veterans Administration Hospital, Brooklyn, New York, and the Department of Medicine, Division of Dermatology and Syphilology, State University of New York, Downstate Medical Center at New York City.This study was supported by a grant from the National Institutes of Health, U. S. Public Health Service, Grant RG-4961.