Transmission of STD's through oral sex is possible, but much lower risk than unprotected vaginal penetration. If, like you say, have acne, the pimples on your lip are most likely to be pimples, especially if you have been worrying about this for the past few months. As for your vaginal area, that too is probably due to shaving!
If it continues to bother you, put your mind at rest by going to your healthcare provider and getting screened for STD's, but I highly doubt you need to.
If you only gave him oral, that wouldn't cause you to be infected genitally.