My girlfriend had a blister on her vagina and thigh

[anxiety369]

Hello Dr. my girlfriend had a single long large bubble blister on her vagina near her vagina lips and a sting look alike blister her thigh. We did not plan of having sex because we don't want unwanted pregnancy. So all I can do is to finger her and I thought it's safe to finger her and do nothing more than that.
I am scared that it is the cause of it.
We both are clean and we don't have sex before or having any other sex partners. I used to finger her everyday. And we did dry hump (rubbing each other's genital with underwear) on the bed recently.
On that day before I fingered her, I have washed my hands using a soap. Then I fingered her plus rubbing on her genitals and didn't notice anything.
After we did our own things fingering/handjobs, I went shopping with her for almost 1-2 hours.
Then when she get back home, she told me that she had a blister on both of her thigh and vagina and it is a fluid on the blister.
I am worried that she might get a herpes. Can it be the cause if my finger nails are dirty? I am worried about this.
She told me she don't feel the pain unless she touches the blister but not in pain if she walks. And it's gone after 2-4 days later. But she had no discharge or anything. I really want to know whether she has a herpes or not. I am having anxiety for more than a months.

[gracefromHHP]

honey, I have no idea if what is going on is contagious since she was never seen to know what is going on!!!!

[anxiety369]

Okay thank you once again. :)
But is the non-herpes blister on her vagina that contagious?
And will it affect in the future for intercourse?

[gracefromHHP]

you aren't thinking clearly here dear - if neither of you has a std since you've never had other partners, she won't get a std. also std's aren't transmitted from hand to genital contact though many other common infections are.

you have absolutely no reason to think that you gave your partner a std!!!

[anxiety369]

Cause I'm scared I'm the cause of her to get her blister..
If I cut her inner vagina while fingering, can she possibly get std ?
Or I fingered her almost everyday. Is this counted as sexual active?
I'm worried. :( as far as I know if she is sexual active , she s probably get std at younger age. She's 18 though. Coming to 19 next year. Can I know what's the meaning of outbreak? Can those without std have these outbreaks too?

[gracefromHHP]

she's never had other partners so why do you think she has a std?

[anxiety369]

But I'm still curious how do we get herpes from..
From having a lot sexual partners? It's been 3-4 weeks already, she don't have anything reoccur.
I hope it has got to do with the friction that cause her to have blister as she has a thigh that is bigger..
Because we are both clean and do not have other sexual partners..
I wanted to have a long relationship with her and we both trusted each other..
I don't want just because of this, it's going to affect our future. :(
So I just want to ask if I were to accidentally touch her anus and then finger onto her vagina with the finger that i touched on her anus earlier while she's wet. Can she have STD/HIV?
Because as far as I know having an anal sex can cause HIV.