Ive Researched The Symptons Of A Yeast Infection. And It

Ive researched the symptons of a yeast infection. And it seems as though my symptons match. Ive been using vagisil for about two days now but it burns when i apply it. Before i started using it. My v was very itchy so of course i scratched it. Im thinking maybe ive irratated it. Could you please explain why it burns when i apply it.