Ok,been terrified that I contracted herpes even though the Doctor says I am OK. I have found a small pimple, on my outer vagina that is filled with blood today and am terrified! I did some pretty serious training yesterday and got quite sweaty. Could this be the cause. I tried to pop it (I know) and couldn't get anything out of it. It doesn't look like a blister just a really small pimple about the size of a tick filled with blood. Help if you can. Thanks