Hi there,
Hope you are doing better by now. Also, Hopefully by now, you have seen a doctor and it was just an allergic reaction which is possible. I am not certain if semen was involved (if he ejaculated), however if he did, hopefully its an allergic reaction from the semen..Some women are allergic to their partner's semen(takes a while to figure out) but it happens.
Obviously, there are many things (besides a baby and HIV/AIDS) you can get from having oral sex..You would not obviously get STD..but you most certainly can get STI's., which are caused by viruses or bacteria that like warm, soft, moist places such as your mouth and genital area (penis, vulva, vagina, anus, area between penis and anus, and area between vulva and anus). STIs can spread from the genital area to the mouth and from the mouth to the genital area. They are generally passed between people via body fluids or direct contact with skin or sores. Although, there are less risks of STIs in oral sex than in vaginal or anal sex, the risk still exists. You can get a bacterial infection of chlamydia, syphilis (which is now again on the rise)or gonorrhea in your mouth and/or throat, and in some rarer occasions, can develop genital warts in the mouth.
Now back to the rash...If you now a sore blister that is mighty excruciating to the touch..chances are that it is possible it is a herpetic sore(herpes simplesx 1) ..The one you get from having vaginal intercourse is (herpes Simplex II) ..even more painful as there is more moisture between your legs and less air..Herpes is commonly passed between genitals and the mouth, and please be careful, also know that HIV can be passed through cuts in the mouth or small abrasions /cuts/bruises as well.
The truth is: The only 100 percent effective way to avoid an STI is not to have oral, vaginal or anal sex at all. If you are planning to have oral sex, know how to make it safer by avoiding the exchange of bodily fluids and other risky contact -if you are just forming a relationship, I always suggest for both to go to see a doctor or go to a clinic and get tested for all viral/bacterial infectious diseases,including HIV/AIDS)..This is your body..You have to be your own health advocate. Please let us know how you are doing ok? hopefully it is nothing, but worst case scenario...just know that we wre at the peak of modern technology and scientific research, herpes, HIV/AIDS, and most STDS are obviously not death sentences. They can be life altering, but there is hope, but hopefully this 'scare' was enough for you to see how very scary it can be out there. You must protect yourself always! Think of You! Good luck, whatever the case, you will be fine...we will be here.
Take care Bella.
Dr. J
