This photo shows normal results (left), a frothy discharge indicating trichomoniasis (middle), and a white, clumpy discharge indicating a yeast infection (right).
By permission of the publisher. From Spitzer M, Mann M. In Atlas of Clinical Gynecology: Gynecologic Pathology . Edited by M Stenchever (series editor) and B Goff. Philadelphia, Current Medicine, 1998. (Courtesy of the International Society for the Study of Vulvar Disease, from the collection of the late Dr. Herman Gardner.)