after i gave oral sex the last time( about 4 months ago), i noticed some really small, sore bumps on my lips. ive been getting them on and around my lips every since then, and they are slightly bigger now... they are there pretty much all the time. i never got anythingl like this before the incident, but is it possible that i contracted genital herpes to my mouth? is that common?

i got tested about a month ago for the 2 most common strains of herpes, and both came back negative.. help!! what now? i dont wanna have these bumps on my lips for the rest of my life!
please respond any/all advice!!