Some of these medicines are now available without
prescription, such as miconazole (Monistat) and
clotrimazole (Gyne-Lotrimin or Mycelex-G), and
you may use then when you know you have a yeast infection.
Also, Trichomonas vaginitis, which is sometimes called "trick," is the third most frequent vaginal infection. Like bacterial vaginosis, this infection often causes an increased amount of discharge, which may be Green, yellow, or gray in color; frothy.