There are no real set rules for where an initial outbreak will occur. Cold sores are somewhat different to boils though.
Why are you worried? If you have HSV, which I doubt as a result of this encounter, then your body will cope with it just fine, more people have it than do not.
No I didnt have anything like that.... I had similar boil in my lower lip long back and those were due to heat...Now after this oral sex encounter i fear that this single boil on my lower lip that too on the inner side not outwards....to be more specific... Does oral herpes appear internally initially in mouth or externally?? Am worried...
Oral sex is a low risk activity for transfer of STDs, but there are still possibilities.
What you describe doesn't particularly suggest oral herpes. Things come and go in the mouth at a reasonable frequency and you are probably just anxious about the encounter.
Are you sure you do not already have HSV1 from your youth?