Hi, I'm Experiencing A Prickly Tender Irritation On The Outside

Hi, I'm experiencing a prickly tender irritation on the outside of my vagina. I was treated for a yeast infection and VB 4 weeks ago and the sympyoms went away, but, now I concerned that I'm having another yeast infection or something else. I have no visible sores or blisters but I'm concerned that this reoccurring feelings might be an std. Any information would be helpful at this point. Thanks.