Welcome to the Forum. I'll try to help. The chances that this is an initial outbreak of HSV are quite low however the only way to be completely sure is to test. Even experts are wrong in their clinical diagnosis of herpes about 20-25% of the time and this if there are any suspect lesions, testing is recommended. I suggest you see if you can get a culture or better yet, a PCR test of this lesion- the lesion does not need to be a blister or open sore to be tested. Blood tests will not be helpful in sorting this out.
As far as whether it is HSV or not, I doubt it. The exposure you describe was low risk. While HSV is transmitted through direct contact and thus, in theory could have been transmitted in this way, practical experience has taught us that penetrative sexual contact is the most common mode of transmission. I'll presume your partner did not have lesions present at the time of your contact. if this is the case, we now estimate that the risk of acquiring infection form an asymptomatic partner who has HSV ( and there is a good chance that he did not) is in the neighborhood of 1 in 10,000. That does not mean that it doesn't happen but is certainly doesn't happen often on a case-by-case basis.
If I had to guess, this is likely a cyst, folliculitis or some other benign skin process but admittedly, that is only a guess. The best thing you can do is have a knowledgeable clinician take a look.
I hope my comment is helpful. Take care. EWH
Thanks Doc. This is helpful.
I have a coulple of follow up questions. If this bump on my penis were HSV, would it be more likely to be HSV 1 from the oral exposure, or HSV 2 from the genital exposure to my anal area? Is it possible for an HSV 2 blister to appear someplace other than the point of exposure? Finally, if the bump were HSV, would you expect the lesion to ulcerate and scab or might it just resolve without this step?
This question of what this might be cannot be answered. If there is a concern you should, as I alreay said, be examine by someone who can test as needed.
HSV it transmitted by direct contact. A HSV lesion woul o not be expecte to occur at an unexposed location.
Typically if this was HSV, it woul be expected to ulcerate.
I'll repeat one last time- instead of trying to sort this out on line, you should be examined. Playing on-line "what if" games is not in your best interest, whether you have HSV an need to know or, more likely, you don't and need to be reassurred. EWH