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]

you absolutely will not contract herpes from shaking someone's hand!

[anxiety369]

Okay let's say what if that person I'm shaking hands with has a herpes. And I didn't know it.
But i didnt wash for 1-2 hours. Then I finger my girlfriend. Can my girlfriend get a herpes from there? or that I'm thinking too much.. One of my classmates said that he had AIDS. But didnt disclose it any further. By shaking hands with him, I can pass herpes from my finger to my girlfriend's vagina? or will the virus die outside on my finger skin?

[anxiety369]

So there's nothing for me to worry about?
I must stop having an anxiety for no reason..

[gracefromHHP]

for the last time - std's are not an issue here since you were both virgins before each other.

really nothing else I can help you with since your gf was never seen to know what is going on.

[anxiety369]

Okay final question, as long as we're not having sex with each other but only mutual masturbation. Then it's std safe..?

[anxiety369]

I mean the blister that cause friction on her both thighs made her to get those.
Can I get herpes from there? Or if there's no more blister in the future it should be fine? Or the scab will still remain there? /-: I'm worried..