Hi, I am a 19 year old female . I seem to be prone to yeast infections for some reason. and i have an itchy rash that starts at the top of my butt crack in between both cheecks and its spreading to my vagina and inner thighs . when i went to the doctors they said its due to a yeast infetion and gave me a pill to take to clear it up , but here it is one day after and it seems like the situationb has gotten worse.