Redness inside labia

Ive been experiences flare ups of random itching/burning down there for close to a year now... sometimes sharp pains. every STD test has come back negative. im just lost, could this be LS or LP. does this look normal to anybody? please help

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I have had similar issues for a while with redness, itching and almost feels like a chemical burn. I have been able to narrow it down and i am pretty sure it is because my spouse started vaping. I think its being caused by his saliva. Just a thought for you because it took me months to figure this out and there is no information out there. Does your partner vape