Hi,
It seems that you are having either post traumatic bacterial infection or herpes progenitalis.
Bacterial infection , may follow after mild trauma during foreplay.
Herpes progenitalis is viral infection , caused by
herpes simplex virus type 1 or type 2.
As there was
oral sex, it is likely herpes simplex virus type 1.
If it is bacteria, the treatment is simple and easy.
Take short course of antibiotics and apply antibacterial cream.
If no response, there may be HP.
Antibody test against
HSV may be done.
Antiviral drugs like
acyclovir may be taken for long time.
All precaution should be taken for prevention of relapse.
But, all this should be done under gauidance of dermatolologist..
I hope you got my answer..
Regards.
Dr. Ilyas Patel MD