Yeast infection?? not 4 me tho... -.-" please answer!!?

k so 1 of my friends have yeast infection so shes wondering if it treats by itself or do you have to buy some medicine, cream.. etc... -.-". k please answer cuz shes kinda freaking out.
Update: k she said thanx and i read on the internet that 3/4 of women get it so its not like shes not clean !! it just happenes i guess.
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