Any infection if left untreated flares up at times of poor immunity,and bad conditions. Yeast in particular grows in unhygienic,damp places especially if it is not tapped dry ,so firstly u need to get ur culture and sensitivity tests done to figure out the type of bacteria or yeast infection. Also u need to be completely hygenic and make sure u change undergarments twice a day ,also ur partners hygeine needs to be also looked upon . Make sure u do not leave any moisture or dampness in the areas where there is Freq infection. You may use candid cream to resolve the yeast infection by locally applying it in that area.