This photograph shows a "nit" or tiny white egg sack attached to the shaft of a human hair. (Image courtesy of D. Scott Smith, MD, MSc, DTM&H)
Update Date 2/1/2012
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.