Hello about 4 years ago i was diagnosed with hsv1 through a blood test. I have freqently gotten cold sores on my mouth but i began to get 1 blister on the inner part of my groin/bikini line so i went to get tested and the blood work came back positive for hsv1. I rarely had any outbreaks after that until recently i have another sore in the same general area, I was tested again for stds including herpes about a month ago because I am recently in a new relationship and they all came back negative. It showed I had had hsv in the past but no recent infection. But now with this sore i did a herpes culture of it to see and that came back negative so im not sure what to think here. The sore has since popped and ive been putting medication on it but its not going away. Is there a reason why the culture may have came back negative if it is herpes? thank you