I don't mean to scare you but it could be given the timeline... still it might not be.
Have you seen a doctor? The fact that they haven't broken may be a good sign. Culture testing can confirm what they are if in the early stages.
Do these look the the pimples you usually get? Pimples aren't cold sores. A cold sore is usually a cluster of small blisters.
A one time encounter is a low risk quite honestly. If it was the next day, it's too soon for herpes symptoms to appear. You can get a swab/culture, but I'd say your worry is based more on guilt than risk.
After re-reading the post I can agree with petal, the dry skin is most likely not herpes related.
Also, pimples are generally deep-rooted in the skin where herpes blisters manifest on the surface and are "shallow" (- I should note that this may be more opinion than fact, but it's how I view the difference)
They just look like regular run of the mill acne, nothing really out of the ordinary. In the past day or two, they've seemed to be going down as well. No puss, no skin breakage, and like I said, no soreness, itchiness, etc. I've been checking inside my mouth as well and have seen nothing develop. Thank you both for your posts, and if you have any other information for me or recommendations, I would truly appreciate it. I know this isn't professional advice, but like I said, I'm a worrier...
this isn't likely to be std related. it isn't worth any follow up or testing for at this point. You have a history of skin issues. You had a brief unprotected oral sex encounter. Odds are this is just run of the mill skin issues and not worth any more worry.