MY syptoms went a way for two whole days but reappeared again this morning- if this was an std is this possible?

I have had an area of redness just outside of the inner labia, next to my clitoris for a couple of months now. I thought it was yeast, and have been using an anti-fungal cream for a week with no improvement. There is no burning or itching, just mild irritation. I know for certain is not an STD, but cannot for the life of me figure out what is going on. Can anyone help?
I do always wear cotton underwear and have not changed any soaps or detergents recently.

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I havent been sexually activin in a long time but for a while ive been having tiny bumps which itched, burned and sometimes blead, around my vagina, and heavy white and yellow, smelly discharge. Now i recently noticed that theres a bigger bump but its not bothering me at all, yet. Is it an STD?

My client went in hospital for chest pains. While in the hospital the er doctor did a simple urine test that showed yeast and a possible std. Why would the be testing for this stuff with chest pain and what yeast and std could it be. Due to clients rights she does not have to tell what std it is and for my safety I need to know if it could be treated and go away after treatment

How can you tell the difference between if you have a std or just a yeast infection?

-10 pts